Estimating a side or angle is a simple way to check computations.

## Estimate an angle

Estimate the angle shown. Change the slider to include angles up to 360 degrees.

## Estimate all sides and angles on these five triangles:

## Sides and Angle on a Right Angled Triangle

On this applet just one side or one angle is measured. There isn’t enough information to calculate the side/angle requested. Estimate the side by comparing it to the given side. Aim for less than 10% or 5% error! (labels are colour coded and can be repositioned)