Right Angles: The Craft Party

At the Craft Party, Millie and her friends make picture frames and greeting cards. The corner of every card is a perfect square corner, and a square corner has a special name: a right angle.

Remember: A right angle is a square corner, like the corner of a page (it measures 90 degrees). An angle smaller than a right angle is called acute (a cute little angle!). An angle bigger than a right angle is called obtuse. How long the lines are doesn’t matter: only how wide they open.

Magic trick: Fold a piece of paper in half and then in half again: the folded corner is a perfect right-angle tester. If it fits a corner exactly, that corner is a right angle.