Take a look at these angles: What kind are they? Give mathematicians practice identifying obtuse, acute, and right angles in this categorizing activity. Each type is pictured and explained at the top, and scholars examine nine sample angles. They sort the angles in one of two categories: acute or obtuse. Although right angles are described here, learners don't look for these in this exercise. Why would knowing about right angles help them classify the other angles?

Common Core

4.G.A.1