The area of a triangle is found by using a formula. A good way to remember this formula is to remember how one also finds the area of a squre or a rectangle. The area of a square or a rectangle is base times height. The shape of a triangle is basically half of a square or a rectangle therefore the area of a triangle is found with the formula half of base times height. In the case of finding the area of a triangle you multiple your height and your width and then you divide that sum by two.
Remembering that a triangle is basically half of a square or rectangle will help you to remember the formula for finding the area of a triangle whereas it might be tricky formula to remember otherwise.