The area of one triangle is equivalent to half of the area of the rectangle. The area of the ... the perpendicular height may be shown either inside or outside the shape, it is not another side.

The area of the rectangle is 8 cm 2. Two triangles make the rectangle. The area of one triangle is half the area of the rectangle. \(8 \div 2 = 4~\text{cm}^2\) The area of a triangle can also be ...