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The circumference of a circular flower bed is 31.4 meters, and 2 / 5 of the poisonous land in the flower bed is planted with roses. How many square meters is the planting area of rose flowers?
Radius = 31.4 △ 3.14 △ 2 = 5m
The area of rose flower is 3.14 × 5? 2 × 5 / 5 = 31.4 square meters
How many kinds of flowers are there in the 4 cm square flower bed?
Round flower bed of 4cm? It is estimated that the typing error is wrong
A circular flower bed with a radius of 4 m, in which a quarter of the flower bed is chrysanthemum and the rest is Chinese rose. How many square meters are planted in this flower bed?
Area of rose species
=(3/4)*3.14*4*4
=3*3.14*4
=12*3.14
=37.7 square meters
The circumference of a circular flower bed is 31.4 meters, of which 1 / 4 of the area is Chinese rose and the rest is turf. How many square meters is the area of turf
Radius of circular flower bed: 31.4 △ 3.14 △ 2 = 5 (m)
Area of circular flower bed: 5? X3.14 = 78.5 (M2)
Turf area: 78.5x (1-1 / 4) = 58.875 (M2)
The area of turf is 58.875 square meters, about 58.9 square meters
Below is a circular flower bed in the school. Its circumference is 31.4 meters. 60% of the area is planted with roses and the rest is turf. What is the area of turf? emergency
Radius 31.4 △ 2 △ 3.14 = 5m
The area is 3.14 × 5 × 5 = 78.5 square meters
Therefore, turf 78.5 × (1-60%) = 31.4 square meters
There is a circular flower bed. Walking around it is 114 meters. If you plant a rose every 6 meters along the flower bed, how many roses can you plant?
114 △ 6 = 19 (plants);
A: a total of 19 roses can be planted
In triangle ABC, if angle a-angle C = 25 degrees, angle B-angle a = 10 degrees, then angle B =? And explain the reason
If angle B is x degrees, then angle a is X-10 degrees and angle c is x-35 degrees
The equations are as follows:
X+X-10+X-35=180
The solution is x = 75 degrees
So the angle B is 75 degrees
If the bottom of a triangle is 5m long, the area of the triangle will increase by 0.8 M2 if the bottom is extended by 1m. What is the original area of the triangle
Height 0.8 ^ (1 ÷ 2) = 1.6m
The original area is 5x1.6 △ 2 = 4 square meters
The bottom of a triangle is 5 meters long. If the bottom is extended by 1 meter, the area will be increased by 1.5 square meters______ Square meters
1.5 × 2 △ 1 = 3 (m)
5 × 3 △ 2 = 7.5 (M2)
Answer: the original triangle area is 7.5 square meters
So the answer is: 7.5
The bottom of a triangle is 5 meters long. If the bottom is extended by 1 meter, the area will be increased by 1.5 square meters______ Square meters
1.5 × 2 △ 1 = 3 (m)
5 × 3 △ 2 = 7.5 (M2)
Answer: the original triangle area is 7.5 square meters
So the answer is: 7.5
What are the formulas for calculating the area of triangles?
S = 1 / 2ah (bottom * height / 2)
S = 1 / 2absinc (half of the sine product of the two sides and the included angle)
s=1/2acsinB
s=1/2bcsinA
S = under radical: P (P-A) (P-B) (P-C) where p = 1 / 2 (a + B + C)
Tangent radius (R + 2, P = 1 / 2)
RELATED INFORMATIONS
- 1. The area of a parallelogram is 24 square centimeters. What is the area of the triangle with its equal base and height?
- 2. If the area of a triangle is 30 square centimeters less than that of a parallelogram equal to its base and height, what is the area of the triangle?
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- 8. In the acute angle △ ABC, if the degrees of the three inner angles are prime numbers, then the triangle () A. There is only one isosceles triangle B. There are at least two isosceles triangles C. There is only one, but not an isosceles triangle D. There are at least two of them, including non isosceles triangles
- 9. Given that the ratio of the degrees of the three inner angles of a triangle is 4:1:1, then the triangle is () triangle 1. Right angle 2, acute angle 3, obtuse angle
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- 12. The perimeter of a circular flower bed is 18.84m. A stone road with a width of 0.5m is paved around it to calculate the area of the stone road
- 13. There is a circular flower bed with a diameter of 16m, and a 2m wide path is built around it (1) What is the area of this path? (2) How many lamps should be installed along the edge of the circular path every 5m?
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- 19. 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?
- 20. 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?