Question

An isosceles triangle has perimeter 30 cm and each of the equal sides is 12 cm. Find the other two
sides and the area of the triangle.
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Answer 1

Answer:

12+12+x=30

24+x=30

30-24=x

60=x

Hope it helps.

Answer 2

Given :

Perimeter =30 cm

Equal side =12 cm.

So, let the third side be x.

12+12+x=30

24+x=30

x=30-24

Area of triangle :

(By heron's formula)

x=6 cm

Find :

semi perimeter =30/2

=15

Area of triangle =

$\sqrt{s(s - a)(s-b)(s-c)} \\ = \sqrt{15(15 - 12)(15 - 12)(15 - 6)} \\ = 3 \times 5 \times 3 \times 3 \times 3 \ \times 3 \\ = 3 \ \times 3 \sqrt{15} \\ = 9 \sqrt{15} \: cm ^{2} </h2><h2> </h2><h2>$