Question 1

What is the area of a circle with radius 10?

Accepted Answer

A = π × 10² = π × 100 ≈ 314.16 square units.

Question 2

Why is the formula A = πr²?

Accepted Answer

The formula comes from dividing a circle into infinitely thin rings and summing their areas, a process formalized by integral calculus.

Circle Area

数学