Ever hear a yoga teacher insist you should angle your back foot 45 degrees or bend your front knee 90 degrees? Here's why you ...

Great! You’re cutting that pizza at right angle. That means the angle is 90 degrees. Nice big piece for square. So what next? You’re cutting that one at an obtuse angle. That means the angle ...

Quadrilaterals are 2D shapes with four sides and angles. There are six special quadrilaterals with different properties. A rectangle has two pairs of equal sides. It has four right angles (90°).