OG详解-OG6 数学1 Q14

The correct answer is152​​. The area,  A, of a triangle is given by the formula 1​2​bh, where b is the length of the base of the triangle and h is the height of the triangle. In the right triangle shown, the length of the base of the triangle is 5 inches, and the height is 3 inches. It follows that b = 5 and h = 3. Substituting 5 for b and 3 for h in the formula A =1​2​bh yields A = 1​2​ (5)(3) which is equivalent to  A = 1​2​ (15), or A = 15​2​. Therefore, the area of the triangle, in square inches, is15​2. Note that 15/2 and 7.5 are examples of ways to enter a correct answer.