Question

An isosceles triangle has perimeter of 30 cm and each of the equal sides is 12cm . Find the area of triangle

Give correct answer

Answer 1

Answer:

Step-by-step explanation:

Let The Third Side Be xcm.

Now Perimeter = 12+12+x

24+x = 30

x = 6

Now Find The Area Using Herons Formula

Semiperimeter = 30/2 = 15

Sq Root(15(15-12)(15-12)(15-6) ) = Sq Root(15*3*3*9) = Sq Root(1215) = 34.85 cm^2

So Area is 34.85cm^2

Answer 2

Answer:

Each of the equal side of an isosceles triangle is 12cm.

a =12cm ; b = 12cm

perimeter=30 cm

↪a+b+c =30

↪12cm+12cm+c=30cm

↪24cm+c =30cm

↪c=30cm - 24cm

↪c=6m

s= perimeter

2

= 30cm

2

=15cm

Area of the Triangle = √s(s-a)(s-b)(s-c)

=√15(15-12)(15-12)(15-6)

=√15 x 3 x 3 x 9

=√ 5 x 3 x 3 x 3 x 3 x 3

= 3 x 3 x √3 x 5 cm²

= 9 √15 cm²

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The Answer gave is that Done myself you plz better check it once!

IG, This helps!