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The area of a square flower bed is 225 square meters. How many meters is its side length?
That's 225 equals 15
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Xiao Hong walked three times along a square flower bed, 144 meters in total. How many square meters is the area of this flower bed?
144 △ 3 = 48 to get the perimeter of the square
Build a square flower bed in the center of the rectangular field. The area around the flower bed is equal to the area of the flower bed
It is 6 meters more than the side length of the flower bed, and 4 meters more than the width of the field
Let the length of the square be x, then the length of the rectangle is 6 + X and the width is 4 + X,
{6 + X} times {4 + X} = 2 times {the square of X}
X = 13 or - 2
So x = 12
The rectangle is 12 + 6 = 18 in length and 12 + 4 = 16 in width
The area is 18 times 16 = 288
The side length of a square flower bed is 25 meters. There is a 2 meter wide path around the flower bed. How many square meters is the area of this path?
29^2-25^2=（29-25）*（29+25）=4*54=216
For a right triangle, one right side is 12 cm long, the oblique side is 20 cm long, the height on the oblique side is 9.6 cm, and how long is the other right side?
Let the length of the other right angle side be x cm. According to the meaning of the question, we get 12x = 20 × 9.6, and the solution is x = 16. The length of the other right angle side is 16 cm
The two right sides of a right triangle are 3 meters and 4 meters respectively. The length of the hypotenuse is 5 meters. How many meters is the height of the hypotenuse
H = 3 * 4 / 5, utilization area unchanged
The length of one right side of a right triangle is 4 meters, the length of the hypotenuse is 5 meters, and the corresponding height of this side is 2.4 meters. What is the length of the other right side of the triangle
4 × 5 △ 4 = 3 or 5 ^ 2-4 ^ 2 = 3 under root sign
If one side of a right triangle is 13 and the other two sides are natural numbers, calculate the perimeter
If one side of a right triangle is 13 and the other two sides are natural numbers, calculate the perimeter
If the known condition is a right triangle, and the length of one right side is 13, let the hypotenuse C and the other right side be B, then c > b and C > 13
c*c-b*b=13*13=169
(c+b)*(c-b)=169
It is known that both C and B are natural numbers, and C > b, so (c + b) * (C-B) is also a natural number. If the product of two natural numbers is 169, only 13 * 13 or 169 * 1, while (c + b) > (C-B), only (c + b) * (C-B) = 169 * 1,
That is to say, only (c + b) = 169 and (C-B) = 1, we can get the following equations:
c+b=169
c-b=1
By solving the above equations, we get the following results
c=85,b=84
So the perimeter of right triangle is 13 + C + B = 13 + 84 + 85 = 182
If the hypotenuse length of a right triangle ABC is C = 1, what is the maximum value of its inscribed circle radius r,
As the title
Let a, b.r/a = (B-R) / B, r = AB / (a + b). A ^ 2 + B ^ 2 = 1, (a + b) ^ 2-2ab = 1, r = 1 / 2 [(a + b) - 1 / (a + b)] be increasing, and the range of a + B is (0, root 2). When it is root 2, the maximum is root 2 / 4
For a piece of iron wire, 2 / 7m is used for the first time and 5 / 6m is used for the second time. How many meters are used for the two times?
For a piece of iron wire, 2 / 7m is used for the first time and 5 / 6m is used for the second time. A total of 2 / 7 + 5 / 6 = 47 / 42m is used for two times
RELATED INFORMATIONS
- 1. After adding 3cm to the two adjacent sides of a square, we get a new square. The area of the new square is 39 square centimeters larger than that of the original square. What's the area of the original square?
- 2. A circular pool with a radius of 6 meters is surrounded by a circular path with a width of 1 meter. How many square meters is the area of this path?
- 3. Guangming primary school built a semicircular flower bed along a wall. The fence around the flower bed is 31.4 meters long. How many square meters does the flower bed cover?
- 4. The school has built two cylindrical flower beds. The inner diameter of the flower beds is 3 meters, and the height is 0.8 meters. If the height of the filling soil is 0.5 meters, How many cubic meters of soil are needed for the two flower beds?
- 5. Street Park to build a diameter of 12 meters of circular flower bed, around with tiles paved a 3 meter wide path, each tile area is 0.9 square meters Street Park to build a diameter of 12 meters of circular flower bed, around with tiles paved a 3 meter wide path, the area of each tile is 0.9 square meters, how many tiles to use to lay this path?
- 6. There is a flower bed 25 meters long and 20 meters wide. If a 3 meter wide path is built around the flower bed (as shown in the figure), what is the area of the path?
- 7. It is known that the length of rectangular ABCD is 30cm and the width is 20cm. A proper plane rectangular coordinate system is established, and the coordinates of a, B, C and D are obtained first Then the rectangle is made in the rectangular coordinate system ABCD.Thank you
- 8. For a cylindrical pool, the inner wall and bottom of the pool should be inlaid with ceramic tiles. The diameter of the pool bottom is 6 meters, and the pool depth is 1.2 meters. How many square meters is the area inlaid with ceramic tiles?
- 9. For a cylindrical pool, the inner wall and bottom of the pool should be inlaid with ceramic tiles. The diameter of the pool bottom is 8 meters, and the pool depth is 2 meters. How many square meters is the area inlaid with ceramic tiles at most
- 10. As shown in the figure, in the quadrilateral BCDE, angle c = angle, bed = 90 degree, angle B = 60 degree, extend CD, be, get the right triangle ABC The length of BC
- 11. When the side length of a square increases by 3cm, its area increases by 39cm2. The side length of the square is () A. 5cmB. 6cmC. 8cmD. 10cm
- 12. In the middle of a circular grassland with a girth of 25.12 meters and a flower bed with a radius of 2.5 meters, how many square meters of grassland are left?
- 13. In a round flower bed, half a circle, 141.3m, the radius of this flower bed is
- 14. The diameter of a round flower bed is 8m. How many meters is the perimeter of the flower bed and how many square meters does it cover
- 15. There is a round flower bed in the park, with a diameter of 30 meters. Grandfather Zhang ran around the flower bed for 5 laps in morning exercise. How many meters did he run this time?
- 16. As shown in the picture, a square street garden, the middle is a square flower bed, surrounded by a path, the side length of the flower bed is 12 meters, the width of the path is 1 meter What's the area of the hotel?
- 17. A square flower bed should be built in the park, and a 2m wide lawn should be laid beside the flower bed. The lawn area is 96 square meters. What is the total area of the flower bed and lawn? In the simplest way. No equations
- 18. As shown in the picture, the shape of a 40 meter long vegetable greenhouse is a semi cylindrical shape with a 3-meter-high semi-circular brick wall at both ends. The vegetable greenhouse is covered with plastic film until the end How many square meters less plastic film is needed? How many cubic meters of space is the whole vegetable greenhouse?
- 19. The length of the three wires is 215 meters. One third of the first wire is used, three fifths of the second wire is used, and three fourths of the third wire is used How long are the three wires?
- 20. Cut a 1997 cm long wire into 199 cm and 177 cm long wires, and the rest is at least 100 cm long______ Cm