BBC4 年
Parallel and perpendicular lines
Perpendicular lines meet at a right angle. A right angle is a quarter turn, which is 90 degrees (90˚). Right angles are sometimes shown with a small square where the lines meet. Perpendicular ...
BBC4 年
Parallel and perpendicular lines
Perpendicular lines meet at a right angle. A right angle is a quarter turn, which is 90 degrees (90˚). Right angles are sometimes shown with a small square where the lines meet. Perpendicular ...