A triangle has a base of 7 centimetres and a perpendicular height of 4 centimetres. What is its area?

الشرح

Half of 7 multiplied by 4 gives 14 square centimetres of surface for this triangle. The value 28 leaves the half out and would fit a rectangle measuring 7 centimetres by 4 centimetres rather than a triangle standing on that base.