Academic Challenge Practice Test 2026 - Free Practice Questions and Answers Study Guide

Area is found using A = πr^2, so you square the radius and multiply by π. With radius 7, r^2 = 49, giving A = 49π. This shows why the area scales with the square of the radius—doubling the radius would quadruple the area (14 becomes 196π, not just 28π, for example). The other numbers come from mixing up the formula or squaring the wrong quantity: using the radius instead of its square gives 7π, and misplacing factors can lead to 14π or 98π.