Question

What is the area of a circle with diameter 10 cm?

• A. \(25\pi \, \text{cm}^2\)
• B. \(50\pi \, \text{cm}^2\)
• C. \(100\pi \, \text{cm}^2\)
• D. \(200\pi \, \text{cm}^2\)

Hint:

The area of a circle is \(\pi r^2\), where \(r\) is the radius (half the diameter).

Answer 1

The Correct Option is A

The radius is half the diameter: \(r = 10 / 2 = 5 \, \text{cm}\).
The area of a circle is: \[ A = \pi r^2 = \pi \cdot 5^2 = 25\pi \, \text{cm}^2 \] Thus, option (1) is correct.