If the height of a triangle is increased by 25%, in order to keep the area of the triangle unchanged, the bottom should be () a, reduced by 25% B, reduced by 20% and increased by 25%

If the height of a triangle is increased by 25%, in order to keep the area of the triangle unchanged, the bottom should be () a, reduced by 25% B, reduced by 20% and increased by 25%

Option B
Set the height as H and the low as K. when the height is increased by 25%, the height is (1 + 25%) H = 5 / 4H and the low becomes K1. From the same area, there is s = 05 * h * k = 0.5 * 5 / 4H * K1, that is, k = 5 / 4k1, and K1 / k = 4 / 5, so the bottom is reduced by 20%. B should be selected

The base of a triangle increases by 25%. To keep the area unchanged, the height decreases by ()%
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If the height is set as h, the bottom is a, and the reduced height is g
25ah = 2S,
25ag = ah,
So G: H = 4:5
If you get high, you need to reduce it by 20%