# Ratio between sides of a right-angled triangle

- Author:
- Ho Wing Yan

## Aim

The aim of this activity is to study the relationship between angle and sides of a right-angled triangle.

## Activity 1 instruction

Drag the point A or point B may change the length of the side of right-angled triangle ABC. The data is recorded in the spreadsheet below.

## Activity 2 instruction

Drag the hangle of the slider will change angle A.
Repeat activity 1 for other angle.

## What do you notice?

If the angle A is fixed and you change the length of any side, will the ratio AB : BC : AC change?

Explain why.

If angle A is double, will the ratio of AB : BC double?

Explain.