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)