This worksheet is about finding the circumferences and areas of circles using a calculator.
You must learn these two important formulae for a circle of radius, r :
Circumference of a circle = 2 π r
Area of a circle = π r2
Find the circumference and area of a circle of radius 6 cm.
Circumference = 2 π r = 2 x π x 6 = 12 x π = 37.7 cm (1 dp)
Area = π r2 = π x 62 = π x 36 = 113.1 cm2 (1 dp)