Question

What is the area of the triangle

Answer 1

First find the length of the  longest leg 

x^2  = 13^2 - 5^2      ( by the Pythagoras theorem)
x^2 = 144
x = 12  

Area of the traingle = 1/2 * base * height 
= 1/2 * 5 * 12
= 30 units^2