The bottom of a triangle increases by 1 / 10, the height decreases by 1 / 10, and the area decreases by several parts

The bottom of a triangle increases by 1 / 10, the height decreases by 1 / 10, and the area decreases by several parts

Area reduction = 1 - (1 + 1 / 10) (1-1 / 10) = 1 / 100

In the rectangle below, the area of triangle a is 4 square centimeters, and that of triangle B is 6 square centimeters

A: B area ratio = 4:6 = 2:3, because a and C are similar, so a and C area ratio = (2:3) &# 178; = 4:9, so C area = 9cm &# 178; because a + shadow area = B + C, so shadow area = 9 + 6-4 = 11cm &# 178; if you agree with my answer, please click "adopt as satisfactory answer" in the lower left corner, I wish you progress in your study!

As shown in the figure, if the shaded part is 13 times the area of the rectangle and 15 times the area of the triangle, then the ratio of the area of the rectangle to that of the triangle is ()
A. 3：5B. 5：3C. 3：2D. 2：3

Let the area of rectangle be a, the area of triangle be B, a × 13 = B × 15, a: B = 15:13 = 3:5; answer: the area ratio of rectangle and triangle is 3:5; so choose: a

Can you use the translation method to make each figure below into a rectangle? And draw the rectangle below