Ontario Mathematics Proficiency Practice Test

To find the area of a triangle, you can use the formula:

Area = (base × height) / 2.

In this case, the base is 10 cm and the height is 5 cm. Plugging these values into the formula gives:

Area = (10 cm × 5 cm) / 2 = 50 cm² / 2 = 25 cm².

This calculation shows that the area of the triangle is indeed 25 cm², making the first choice the correct answer. Understanding the formula is crucial, as it applies to any triangle. By using the base and height directly, you ensure accuracy in finding the area.