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

The video tutorial explains how to determine if triangle ABC is a right-angled triangle using Pythagoras' theorem. Given the perimeter and two side lengths, the third side is calculated. The theorem is applied to verify if the triangle is right-angled, concluding it is not. The tutorial also discusses the allocation of marks for solving the problem.

What is the perimeter of Triangle ABC?

• 25 centimeters

• 20 centimeters

• 30 centimeters

• 15 centimeters

How do you calculate the length of side AC?

• Add the lengths of AB and BC

• Subtract the sum of AB and BC from the perimeter

• Multiply the lengths of AB and BC

• Divide the perimeter by the sum of AB and BC

What is the length of side AC in Triangle ABC?

• 5 centimeters

• 9 centimeters

• 6 centimeters

• 8 centimeters

Which theorem is used to determine if Triangle ABC is right-angled?

• Triangle Inequality Theorem

• Pythagoras' Theorem

• Sine Rule

• Cosine Rule

What is the result of 7^2 + 4^2 in the context of this problem?

• 100

• 81

• 65

• 49