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 r^{2}

**Examples**

Find the circumference and area of a circle of radius 6 cm.

**Answers**

**Circumference = 2 π r **= 2 x π x 6 = 12 x π = **37.7 **cm (1 dp)

**Area = π r ^{2}** = π x 6

^{2}= π x 36 =

**113.1**cm

^{2}(1 dp)