Area of Circles
Formula: A = πr²
Where A = area, π ≈ 3.14, and r = radius
Part A: Calculate the area of each circle
Show your working. Round your answers to 2 decimal places.
1. Radius = 5 cm
Working: _______________________________________________
Area = _______________ cm²
2. Radius = 8 m
Working: _______________________________________________
Area = _______________ m²
3. Radius = 12 cm
Working: _______________________________________________
Area = _______________ cm²
4. Radius = 3.5 m
Working: _______________________________________________
Area = _______________ m²
Part B: Find the area when given the diameter
Remember: radius = diameter ÷ 2
5. Diameter = 10 cm
Radius = _______________
Working: _______________________________________________
Area = _______________ cm²
6. Diameter = 14 m
Radius = _______________
Working: _______________________________________________
Area = _______________ m²
Part C: Word Problems
7. A circular garden has a radius of 6 metres. What is the area of the garden?
Working: _______________________________________________
Answer: _______________ m²
8. A pizza has a diameter of 30 cm. What is the area of the pizza?
Working: _______________________________________________
Answer: _______________ cm²