Estimating and Measuring Angles WORKSHEET

Students can practice using estimation to check the measurement of acute, obtuse, and reflex angles, while using correct angle notation within polygons with this worksheet.

Here, two irregular pentagons are drawn with vertices labelled. For the first pentagon, students are given the angles to estimate and measure in an anticlockwise order using notation ∠DEA. For the second pentagon, the angles are in a random order for learners to again estimate and measure the size of each. There is one reflex angle in this pentagon, too.

Why not ask your students to find the sum of the angles in each polygon; what do they notice?