GCSE Secondary Maths Age 13-17 - Geometry & Measures: Arc length - Explained

The video tutorial explains how to calculate the length of an arc in a circle sector with a radius of 7 and an angle of 40 degrees. It begins by determining the circle's circumference using the formula π multiplied by the diameter. The tutorial then focuses on finding the arc length by multiplying the fraction of the circle's angle (40/360) by the total circumference. The final answer is rounded to three significant figures, resulting in 4.89 cm. The video also discusses the allocation of marks for the calculation steps and emphasizes understanding the process for solving similar problems.

What is the radius of the circle in the sector?

How do you calculate the circumference of a circle?

What is the formula used to find the length of the arc A to B?

What is the final answer for the length of the arc A to B rounded to three significant figures?

What should you ensure you understand when solving questions about sectors of circles?