GCSE Secondary Maths Age 13-17 - Geometry & Measures: Circumference of a circle - Explained

The video tutorial explains how to determine if a 50 cm ribbon is long enough to wrap around a circular cake with a 7-inch diameter. It covers calculating the circumference using the formula π multiplied by the diameter, converting inches to centimeters, and concludes that one ribbon length is insufficient. The tutorial emphasizes the importance of unit conversion and provides a marking scheme for the problem.

What is the diameter of Levi's birthday cake?

• 5 inches

• 6 inches

• 7 inches

• 8 inches

Which formula is used to calculate the circumference of a circle?

• π multiplied by the radius

• 2π multiplied by the radius

• 2π multiplied by the diameter

• π multiplied by the diameter

How many centimeters is one inch equivalent to?

• 2.54 cm

• 2.84 cm

• 3.14 cm

• 1.54 cm

What is the circumference of the cake in centimeters?

• 65.8 cm

• 60.8 cm

• 55.8 cm

• 50.8 cm

Is one length of ribbon sufficient to wrap around the cake?

• Yes, it is enough

• No, it is not enough

• It depends on the ribbon's width

• Only if the ribbon is stretched