# StudySquare

# SQA National 5 Maths Circles

This page covers the following topics:

1. Radius and diameter of a circle

2. Circumference of a circle

3. Area of a circle

The radius of a circle is the distance between the centre of a circle and the edge. The diameter of a circle is the distance between two edges of a circle passing through the centre. The diameter is double the size of the radius.

The circumference of a circle can be calculated using the following formula: C = 2πr, where r is the radius of a circle.

The area of a circle is given by the formula: A = πr², where r is the radius of the circle.

# 1

Calculate the area of a circle with radius 5 cm.

# 2

Given that r = 8 cm, calculate the circumference of the given circle.

# 3

Sketch a diagram of a circle, labelling for its radius and diameter.

# 4

Given that the radius of a circle is 4 cm, calculate the length of its diameter.

# 5

Use the given diagram to calculate the diameter of the circle.

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