Question

the perimeter of an isosceles triangle is 21
cm find the measure of equal sides given that the third side is 5 cm​

Answer 1

Let the equal sides be x

Then,

Perimeter = 21cm

5 + x + x = 21

2x + 5 = 21

2x = 21 - 5

2x =16

x = 8

Therefore, measure of equal sides =
8 cm

Answer 2

HERE IS YOUR ANSWER SHINCHAN : )

PERIMETER OF ISOSCELES TRIANGLE = 21

BUT

PERIMETER = S1 + S2 + S3

FOR THE TRIANGLE S1 = S2

SO PERIMETER = S1 + S1 + S2

21 = 2 S1 + 5

21 - 5 = 2S1

16/2=S1

8= S1

measure of equal sides is 8 cm

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