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The area of a triangle is 5 / 8 square meters and the height is 3 / 10 decimeters. How many decimeters is its bottom
S Δ = 5 / 8 square meter = 125 / 2 square decimeter
From s Δ = L * H / 2
L = s Δ * 2 / h = (125 / 2) * 2 / (3 / 10) = 2500 / 3 (decimeter)
There is a rectangular grassland, 48 meters long and 30 meters wide. There is a tree every 6 meters around it. How many trees should be planted at least?
You can draw 22 trees
The sixth grade students took part in the tree planting activities of "welcoming the Asian Games". Among them, 80 trees were planted in class 1 and 9 trees were planted in class 2 8. The number of trees planted in class 3 is 7 than that in class 2 7 more trees in class 9______ Trees
80×9
8×7
9+7，
=70+7，
=77 (trees);
A: Class Three planted 77 trees
So the answer is: 77
The bottom edge of a triangle is 5.2 meters. If the bottom edge is extended by 2 meters, the area will be increased by 5 square meters. What is the original area of the triangle?
(5.2+2)h/2-5.2*h/2=5
h=5m
s=5.2h/2=13m^2
A triangular vegetable field has a base length of 16m. If the bottom edge is extended by 1.5m, the area of vegetable field will be increased by 6 square meters. What is the original area of this triangle vegetable field?
6x2 = 12 square meters
12 / 1.5 = 8M
16x8 / 2 = 64 square meters
So it turns out that this triangular vegetable plot has an area of 64 square meters
The bottom of a triangle is 5m long. If the bottom is extended by 1m, the area will increase by 3.25m2. What is the area of the original triangle?
If the height of the original triangle is h, the extended triangle is the same height as the original triangle, so 1m * H / 2 = 3.25, then H = 6.5, and the area of the original triangle = 5 * 6.5 / 2 = 16.25
1. The bottom length of a triangle is 5 m. if the bottom edge is extended by 1 m, the area will be increased by 1.5 m to the square. Please find out the square of the original triangle area What's more, if you give some sugar to three children on average, you'll get one more piece. If you give four children an average, you'll get three less. If you give me five children, you'll get one more piece. How many pieces are there at least? In today's day, teacher Ni's question is too difficult. Please forgive me more
1. Height = 1.5 * 2 / 1 = 3M, original triangle area = 5 * 3 / 2 = 7.5 (m ^ 2) answer: the area of the original triangle is 7.5 square meters. 2. If you give 4 children on average, you will lose 3 pieces, that is, the multiple of 4 will be less than 3, that is, the multiple of 4 will be 1 more; if you give the average to 3 children, you will get 1 piece more, that is to say, the multiple of 3 will be more than 1
As shown in the picture, there is a triangular grassland with one side length of 30m. In the drawing, the length of this side is 6cm, and the other two sides are 5cm. What is the area of this grassland? The picture shows a triangle with 5cm long waist and 6cm bottom edge
Let the three sides of the triangle be a = 6 cm, B = 5 cm, C = 5 cm,
1. The area of the triangle is 1 / 2 * bottom * height (all three sides can be used as the bottom)
This is an isosceles triangle with a base of 6 cm. The height of the triangle can be obtained by the sum of the squares of the two right sides equal to the square of the hypotenuse
According to the formula, the area of the figure is (6 * 4) / 2 = 12 cm? 2, and then the actual area is 0.0012 * (30 / 0.06) 2 = 0.0012 * 250000 = 300 m2;
2. The area of triangle is 1 / 2bcina = 1 / 2acsinb = 1 / 2absinc
According to the figure calculation, Sina = 0.96, SINB = 0.8, sinc = 0.8. According to the formula, we can get the area = 1 / 2 * 5 * 5 * 0.96 = 1 / 2 * 6 * 5 * 0.8 = 1 / 2 * 6 * 5 * 0.8 = 12 cm? 2, and then enlarge according to the proportion to get the actual area of 0.0012 * (30 / 0.06) 2 = 0.0012 * 250000 = 300 m ^;
3. The area of triangle is ABC / 4R (where R is the radius of circumscribed circle)
The circumscribed circle has a formula of a / Sina = B / SINB = C / sinc = 2R. According to the figure calculation, Sina = 0.96, SINB = 0.8, sinc = 0.8. According to the formula, we can get the circumscribed circle radius r = 3.125 cm. Therefore, according to the formula, we can get the area = (6 * 5 * 5) / (4 * 3.125) = 12 cm? 2, and then enlarge it according to the proportion, and the actual area can be 0.0012 * (30 / 0.06) 2 = 0.0012 * 250000 = 300 m2;
4. By solving the radius of inscribed circle, the area of triangle is s = (a + B + C) R / 2 (where R is the radius of circumscribed circle of triangle)
The inscribed circle has the formula r = sqrt [(P-A) (P-B) (P-C) / P], where sqrt is the root sign,
P is half of the circumference of the triangle, P = (a + B + C) / 2. According to the figure calculation, we can get the radius of the inscribed circle r = 1.5 cm. Therefore, according to the formula, we can get the area = (6 + 5 + 5) * 1.5 / 2 = 12 cm? 2, and then enlarge it in proportion,
The actual area is 0.0012 * (30 / 0.06) 2 = 0.0012 * 250000 = 300 m2;
5. The area of triangle is sqrt [P (P-A) (P-B) (P-C)], P = (a + B + C) / 2:1
According to the formula, it can be concluded that the area = sqrt [8 * (8-6) * (8-5) * (8-5)] = 12 cm2, and then the actual area can be 0.0012 * (30 / 0.06) 2 = 0.0012 * 250000 = 300 m2
I hope I can help you
In order to beautify the environment, an isosceles triangle green space with a side length of 10m is planned to be paved with 30 square meters of turf, Please work out the length of the other two sides of the isosceles triangle green space,
If 10m side is the bottom and the bottom edge height is h, then
5h=30
h=6m
Waist length = √ 61m
If 10m is the waist and the angle between the two waists is a, then
(1/2)10*10sina=30
sina=3/5
Then the bottom edge length is 10sina * 2 = 12m
In order to beautify the environment, we plan to lay an isosceles triangle with lawn in a certain district In order to beautify the environment, it is planned to lay an isosceles triangle green area with lawn in a community. The area of the isosceles triangle is known to be 30 square meters, and one side is 10 meters long. Calculate the length of the other two sides We need to separate out obtuse triangles.
1. If the length of this side is 10 and it is waist, then 30 * 2 / 10 = 6, then 6 is the height on the waist, then the root of 100-36 is 8, so 10-8 = 2, the square of 2 + the square of 6, and then the root sign gets 2 * root sign 10, so the other side 10 of the triangle is another 2 * root sign 102
RELATED INFORMATIONS
- 1. It is planned to use 30 square meters of turf to lay an isosceles triangle green space with one side of 10 meters. Please work out the other two sides of the isosceles triangle
- 2. The area of a triangular vegetable field is 32.4 square meters. The height of one side is 4.5 meters. How many meters is this side?
- 3. China's territory is about 5000 kilometers long from east to west and 5500 kilometers from north to south, on a scale of 1:8000000
- 4. On a map with a scale of 1:4000, the central square is 5cm long and 3.75cm wide. On another map with a scale of 1:5000, the center square is wide What is the area of the field on the graph The proportional solution is the equation solution
- 5. The sum of three sides of a right triangle is 48 cm, and the ratio of the three sides is 5:4:3. What is the area of this triangle?
- 6. A triangle and a parallelogram have the same height and area. The base of the parallelogram is 16 cm. How many centimeters is the bottom of the triangle?
- 7. The area of a triangle is 12 square decimeters, the bottom is 6 decimeters, and the height is______ Decimeter
- 8. The area of a triangle is 12.5 DM2 less than that of a parallelogram of equal base and height______ dm2．
- 9. The height of a triangle is 5 or 2 meters. If the height is extended by 2 meters, the area of the triangle line will be increased by 10 square meters. What is the area of the original triangle
- 10. An isosceles right triangle flower bed, a right angle side of the triangle is 14 meters long. What is the area of this triangle flower bed
- 11. A triangle has an area of 40 square meters, a height of 10 meters and a bottom of () meters
- 12. Street Garden covers an area of 9 Among them, 1 The garden covers an area of 1.5 hectares 10. How many hectares is the lawn larger than the flower bed?
- 13. A triangle area of 0.8 hectares, its bottom is 500 meters, what is the height
- 14. There are three grasslands with an area of 5, 15 and 36 hectares. The grass on the grassland is as thick and grows as fast. The first grassland can feed 12 cattle for 28 days, the second grassland can feed 21 cattle for 63 days, and the third grassland can feed 144 sheep for several days? (the amount of grass eaten by four sheep in one day is the same as that of one cow in one day)
- 15. The bottom of a triangle vegetable field is 200 meters and the height is 100 meters
- 16. The bottom of a triangle is 7 meters. If the bottom is extended by 2 meters, then the area will be increased by 6 square meters. What is the original area of the triangle Do not list equation
- 17. The base of a triangle is 3 / 2 meters, and its height is 4 / 9 meters. What square meters is its area!
- 18. The parallelogram is divided into two parts: trapezoid and triangle. Their areas differ by 13 square centimeters The base of the parallelogram is 9.5 cm long and 6.5 cm high. It is divided into two parts: trapezoid and triangle. Their area difference is 13 square centimeters. Find the upper bottom of trapezoid
- 19. The base of a triangle is 3.5cm, the area is 10.5cm, and the height is the equation
- 20. The bottom of the triangle is 10 cm, and its area is 80 cm 2. If its area is reduced by 20 cm, how many cm should the bottom be compressed?