Question

triangle.
13. The base of an isosceles triangle is 12 cm and its perimeter is 32 cm. Find its area.
surface of a triangular board at 80 paise per square metre i​

Answer 1

Answer:

b=12

2a+b=32

a=10

s=((b^2-a^2)/4)^(1/2)=((144-100)/4)^1/2=root 11

area =1/2 ×s×b

=(root 11)×10/2

=5root 11