The side of a square decreased by 20%. what percent its area will be decreased?
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Answered by
6
Area = (Side Length)²
ΔA/A × 100 = 2 × (ΔL/L × 100)
= 2 × 20%
= 40%
Area will decreased by 40%
ΔA/A × 100 = 2 × (ΔL/L × 100)
= 2 × 20%
= 40%
Area will decreased by 40%
Answered by
5
answer is 36%
Step-by-step explanation:
Let the side of square be x
• area = x²
Therefore, decreased side = x- 20% of x
= 80x/ 100
area = 6400x/ 10000 = 64x²/100
now .
decrease in area = x²- 64x² / 100
= 36x²/ 100
Hence , required percentage = 36x²/100 ×100×1/x²
= 36%
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