The area of a quadrilateral is 50 square decimeters, and the shadow part is a triangle. What is the area of the triangle? The area of a parallelogram is 50 square decimeters. The shadow is a triangle. What is the area of the triangle?

If a triangle and a parallelogram are equal in height, the area of the triangle is half of that of the parallelogram, 25 square decimeters

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1. 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?
2. 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
3. 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______ ．
4. Given the first-order function y = - 5 / 12x + 12, find the area of the figure enclosed by the image and the coordinate axis
5. 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?
6. What is 4 equal to under the root of 3
7. The value of 34 out of 25 of the root sign is
8. 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
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. 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
11. Two line segments divide the triangle into three triangles and a quadrilateral. As shown in the figure, if the areas of the three triangles are 3, 7 and 7 respectively, the shadow area is?
12. As shown in the figure, triangle ABC is divided into triangle BDE and quadrilateral ACDE by line segment de. question: what is the area of triangle BDE that is the area of quadrilateral ACDE?
13. As shown in the figure, what is the area of the triangle with a (0,3), B (1,0) and C (2,2) as vertices
14. The maximum value of the function y = SiNx + 3cosx is () A. 1B. 2C. 3D. 2
15. What is the value of X, y = 1-2 / 3 SiNx take the maximum and minimum values? What are the maximum and minimum values
16. The maximum value of the function y = x-sinx on [π / 2, π]? Please indicate the reason,
17. Is the maximum value of function y = 2 + SiNx 2 right or wrong
18. F (x) = the minimum positive period under the root sign (the square of SiNx to the fourth power of SiNx)
19. Given the function f (x) = - SiNx + SiNx + A, the square above that SiNx, if f (x) = O has a real number solution to find the range of a, if x belongs to R 1 (less than or equal to FX) less than or equal to ten fourths Help solve it
20. Y = (SiNx) ^ 3 derivation