Question

12. Find the percentage decrease in the area of a triangle if each of its sides is halved.
Decrease in area
Hint: Percentage decrease in area =
*100]
Original area
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Answer 1

Explanation:

100/2=50 is the answer bro

Answer 2

Explanation:

Area of triangle = A = square root of [s(s-a)(s-b)(s-c) where 2s =a+b+c.

Each side is halved,

s’ = s/2

(s’-a’) = (s-a)/2.

s’-b’) = (s-b)/2.

s’-c’) = (s-c)/2.

New area A’ = square root of [s(s-a)(s-b)(s-c) /16. = A/ 4.

Change in area = 3/4 A= 75% decrease