The area of the circle is approximately 1385.4 square millimeters.
The area of a circle can be calculated using the formula πr², where π (pi) is a mathematical constant approximately equal to 3.14159, and r is the radius of the circle.
In this case, the radius is 21 mm. Plugging this value into the formula, we get:
Area = π * r²
Area ≈ 3.14159 * 21²
Area ≈ 1385.44172404... mm²
Rounding the answer to 1 decimal place, we get:
Area ≈ 1385.4 mm²
Complete Question:
The radius of the circle below is 21 mm. Calculate the area of the circle. Give your answer to 1 d.p.