GCSE Secondary Maths Age 13-17 - Shapes & Area: Scale Factor - Explained

The video tutorial discusses the concept of triangle enlargement, emphasizing that while the sides of a triangle increase by the scale factor, the angles remain unchanged. A common misconception is addressed where a student incorrectly assumes that angles also enlarge. The correct explanation is provided, highlighting that only the lengths of the sides change, not the angles.

What happens to the angles of a triangle when it is enlarged by a scale factor?

• The angles increase by the scale factor.

• The angles become right angles.

• The angles decrease by the scale factor.

• The angles remain the same.

Why is Ben's statement about the smallest angle being 75 degrees incorrect?

• Because the scale factor is incorrect.

• Because the smallest angle should be 90 degrees.

• Because the scale factor should be applied to angles.

• Because the scale factor only affects the lengths, not the angles.

What is the effect of a scale factor on the sides of a triangle?

• The sides remain the same.

• The sides are multiplied by the scale factor.

• The sides are divided by the scale factor.

• The sides become equal.

If a triangle is enlarged by a scale factor of 3, what happens to its angles?

• They become 90 degrees.

• They become half of their original size.

• They remain unchanged.

• They triple in size.

What should you remember about angles during the enlargement of a triangle?

• Angles double in size.

• Angles remain constant.

• Angles become obtuse.

• Angles become acute.