GMAS 6th Grade Mathematics Practice Test 2026 - Free 6th Grade Math Practice Questions and Study Guide

A triangle's area is half the product of its base and height. With a base of 20 units and a height of 6 units, multiply the base by the height: 20 × 6 = 120. Take half of that: 120 ÷ 2 = 60. So the area is 60 square units. This comes from the fact that a triangle fits into a rectangle with the same base and height, and the triangle's area is half of that rectangle's area.