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

The video tutorial explains how to calculate the perimeter of an 8-sided shape made from rectangles and congruent right-angled triangles. It involves understanding the diagram, calculating triangle lengths using Pythagoras' theorem, and summing the lengths to find the perimeter. The tutorial also covers the marking scheme, emphasizing the importance of using Pythagoras and avoiding common mistakes like calculating the area instead of the perimeter.

What is the shape of the triangles used in the 8-sided figure?

• Scalene triangles

• Isosceles triangles

• Right-angled triangles

• Equilateral triangles

How do you calculate the missing side of a right-angled triangle?

• By using the area formula

• By using the Pythagorean Theorem

• By using the perimeter formula

• By using the volume formula

What is the length of the hypotenuse in the right-angled triangle used in the problem?

• 8 centimeters

• 6 centimeters

• 12 centimeters

• 10 centimeters

What is the total perimeter of the 8-sided shape?

• 48 centimeters

• 44 centimeters

• 36 centimeters

• 40 centimeters

How many marks are awarded for correctly using the Pythagorean Theorem in this problem?

• Four marks

• Three marks

• Two marks

• One mark