GCSE Maths - How to find the Area and Circumference of a Circle (Circles Part 1) #106

This video tutorial covers the concepts of circumference, diameter, and radius of a circle. It explains how to calculate the area and circumference using the formulas: area = πR² and circumference = 2πR or πD. The tutorial provides examples using both radius and diameter to demonstrate these calculations, emphasizing the relationship between radius and diameter. It also discusses the use of π, an irrational number, in these calculations and suggests using a calculator for precision.

What is the term for the straight line that passes through the center of a circle and touches both sides?

• Circumference

• Radius

• Diameter

• Chord

Which formula can be used to calculate the area of a circle?

• A = 2πD

• C = πD

• A = πR²

• C = 2πR

If the radius of a circle is 4 cm, what is the circumference using the formula C = 2πR?

• 50.3 cm

• 25.1 cm

• 12.6 cm

• 31.4 cm

Given a circle with a diameter of 10 cm, what is the area?

• 100 square cm

• 78.5 square cm

• 50.3 square cm

• 31.4 square cm

How do you calculate the diameter if you know the radius?

• Square the radius

• Multiply the radius by 2

• Divide the radius by 2

• Multiply the radius by π