Question

An isosceles triangle has a base of 30 cm and a perpendicular height of 10cm. What is the length of the two equal sides of the isosceles triangle?

Answer 1

I found `18` cm

Explanation:

Consider the diagram:

You can apply Pythagora's Theorem on one half of the triangle of sides: `10, 15 and a` cm, to get:
`a=sqrt(10^2+15^2)=sqrt(325)=18` cm