Question

the base of an un equal side of an isosceles triangle is 6 cm and its perimeter is 20 CM then its area is
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Answer 1

Answer:

Let the sides of the triangle be a, a and b.

b = 4cm

perimeter = 20cm

a + a + b = 20cm

→ 2a + 4 = 20

→ 2a = 20 - 4 = 16cm

→ a=16/2 = 8cm

S=

perimeter/2= 20/2 = 10cm

Area = √s(sa)(s — b)(s — c)

A =

10(108) (108) (104)

A = =√10 x 2 x 2 × 6 = √2 x 5 x 2×2×

A = 4√15 cm²

Area is 4√15 cm².