Question

6) Lawrence used a protractor to measure three angles in the following diagram. Explain why the measurements can not be accurate.

Answer 1

The measurements cannot be accurate.

Explanation:

Using the exterior triangle theorem. Add the 80 and the 55, which are the interior angles, and it gives you the actual exterior, 135 not 140. In this case, Lawrence used a protractor, which was not accurate since 80 + 55 is 135 not 140.