Question

What is the area of a triangle with side lengths 5,12 and 13?

Answer 1

You should realise this is an equilateral triangle with hypotensue 13. the height/base as 5/12. 1/2 *12*5 should give you the area.

Answer 2

it is a right angle triangle
so area =1/2*base*height
=1/2*12*5

Answer 3

=30