How can we use the concept:
When you know the radius, use the following formula:
A = Area of the circle
Example: What is the area of the circle with the radius of 4 cm?
A = 3.14159… x (4 x 4)
A = 50.27 sq. cm (rounded to the nearest 2 decimal places)
When you know the diameter, use the following formula:
A = Area of the circle
Example: What is the area of the circle with the diameter of 10 mm?
A = (3.14159.../4) x 10 x 10
A = 78.54 sq mm (rounded to the nearest 2 decimal places)
Sample Math Problems
Question 1: What is the area of a circle with a radius of 15 cm?
Answer:
A = 3.14159… x (15 x 15)
A = 706.5 sq. cm
Question 2: What is the area of a circle with radius of 27 mm?
Answer:
