KS2 Primary Maths Age 9-13 - Ratio, Proportion and Algebra: Similar Shapes - Explained

The video tutorial explains how to find the ratio of sides A to B in two similar right-angle triangles. The teacher discusses why measuring the sides is not accurate and instead demonstrates counting squares as a method to determine the ratio. The ratio of A to B is found to be 1 to 4, with alternative answers of 2 to 8 also accepted. The method is highlighted as the easiest and most accurate approach, and the problem is identified as question 22 worth one mark.

What is the main problem discussed in the video?

• Determining the perimeter of a triangle

• Measuring the height of a triangle

• Calculating the ratio of two sides in similar triangles

• Finding the area of a triangle

Why is measuring the sides directly not considered accurate?

• It may not give exact measurements

• It is too simple

• It is time-consuming

• It requires advanced tools

What method is suggested for finding the ratio of the sides?

• Using a ruler

• Counting the squares

• Using a protractor

• Estimating by eye

What is the calculated ratio of side A to side B?

• 1 to 5

• 1 to 4

• 1 to 3

• 1 to 2

Which of the following was also accepted as a correct answer?

• 1 to 3

• 4 to 8

• 2 to 8

• 3 to 6