Area of triangle
A triangle has just three sides! How can you find its area?
Take two triangles and put them one next to the other. What do you see? A parallelogram! It has two pairs of parallel sides and the base corresponds to the base of the triangle.
Draw the height of the triangle and use the same formula to find the area of a parallelogram. But don't forget to divide everything by 2!
A = [b x h] : 2