Triangles: Half of Rectangles

Every triangle is secretly just half a rectangle. Think about it. Finding the area

of a rectangle is easy, right? You just multiply the length by the

width. A 6 by 3 rectangle has an area of 18. Simple. But then you see

a triangle and your brain hurts trying to count all the little squares and half-squares.

Forget that. Just picture the rectangle that the triangle fits perfectly inside.

The area of the triangle is literally just half the area of that rectangle. So,

for our triangle, it's just half of 18, which is 9. It's that easy.