As shown in the figure, the radius of the small round field is increased by 5m to get the large round field. If the area of the field is doubled, the radius of the small round field is reduced=______ .
Let the radius of the small circle be XM, then the radius of the big circle be (x + 5) M. according to the meaning of the question, we can get: π (x + 5) 2 = 2 π X2, the solution is: x = 5 + 52 or x = 5-52
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- 1. The area of the shadow in the right figure is 50 square centimeters, so the area of the ring in the figure is
- 2. The area of the shadow in the figure below is 50 square centimeters, and the ring area can be calculated
- 3. As shown in the figure: the area of the shadow part is 50 square centimeters, find the area of the ring in the figure
- 4. As shown in the figure: the area of the shadow part is 50 square centimeters, find the area of the ring in the figure
- 5. What is the radius and diameter of a 3 m road in a circular garden? What is the perimeter and area?
- 6. The radius of a circle is 3M. If we transform it into an approximate rectangle, the perimeter of the rectangle is () m and the area is () m2
- 7. In the following figure, the outer circle radius is 9cm and the inner circle radius is 5cm
- 8. As shown in the figure, equicircle ⊙ O1 and ⊙ O2 are circumscribed, and both are inscribed with ⊙ O. if the perimeter of ⊙ oo1o2 is 24cm, what is the radius of ⊙ o
- 9. As shown in the figure, the radius of the small round field is increased by 5m to get the large round field. If the area of the field is doubled, the radius of the small round field is reduced=______ .
- 10. Increase the radius of the small round site by 5m to get a large round site, double the site area, and calculate the radius of the small round site?
- 11. The radius of the small round field is increased by 5 m to get the large round field, and the area of the field is increased by 3 times
- 12. As shown in the figure, the radius of the small round field is increased by 5m to get the large round field. If the area of the field is doubled, the radius of the small round field is reduced=______ .
- 13. The radius of the small round field is increased by 5 m to get the large round field, and the area of the field is increased by 3 times
- 14. The value of 34 out of 25 of the root sign is
- 15. What is 4 equal to under the root of 3
- 16. The image of the first-order function y = - 4 / 3x + 4 intersects with the x-axis and y-axis at points a and B respectively, with line AB as the right angle side The image of the first-order function y = - 4 / 3x + 4 intersects with the x-axis and y-axis at points a and B respectively. The isosceles RT △ ABC is made in the first quadrant with the line AB as the right angle. The angle BAC is 90 ° and the point P (a, 2) is a moving point in the coordinate system Q 1. Calculate the area of △ ABC 2. What is the value of a when the area of △ ABP is equal to that of △ ABC?
- 17. Given the first-order function y = - 5 / 12x + 12, find the area of the figure enclosed by the image and the coordinate axis
- 18. If the area of the triangle formed by the first-order function y = x + B and the coordinate axis is 8, the analytic expression of the first-order function is______ .
- 19. As shown in the figure, the upper bottom of trapezoidal aebd is 1.4 decimeters, the lower bottom is 3.2 decimeters, and the area of triangle Abe is 1.54 square decimeters
- 20. As shown in the figure, the top and bottom of a ladder are 3.6 decimeters long. If you add a triangle with a bottom of 6.4 decimeters and an area of 6.4 square decimeters, it will become a parallelogram. What is the area of this trapezoid?