Question

the perimeter of an isosceles triangle is 24cm one of the non equal side is 4cm .find the area of triangle
i need step by step answer​

Answer 1

perimeter of an isosceles triangle is = 2a+b

total perimeter =24

n one of non equal side is =4 cm

thn 2sides are equal 24-4=20 n 20/2= 10 cm of one side n another side is 10 cm.

.

n find their height is ==== √4a²-b²/2

√4*10²-4²/2

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√4*100-16/2 = √400-16/2

..

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√384/2 = 9.79 height

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area of isosceles triangle is = 1/2 b*h

.

1/2* 4* 9.79

.

.

39.1918/2 = 19.5959