Or download our app "Guided Lessons by Education.com" on your device's app store.
The Missing Angle: Quadrilaterals
Turn your fourth grader into a geometry detective! These four-sided shapes are each missing a measurement of their fourth angles. How many degrees is each missing angle? She'll get a little help from this geometry principle: all angles in a quadrilateral must add up to 360 degrees. Not only will she boost her understanding of basic geometry, but she'll get an arithmetic work-out, too!