[list=1][*]Click and drag on the[b] protractor to move it.[/b][/*][*]Click and drag on the[b] red dot to turn it.[/b][/*][*][b]Line the protractor on the angle. [/b]Do you see the angle's measure?[/*][*][b]Check the Answer box [/b]to show your angle's measure.[/*][*]Click and drag the[b] green dots on the angle to change its size.[/b][/*][/list]

A right angle is 90[math]^\circ[/math]. The corner of a book or a piece of paper or the places where the lines cross on a plus sign are examples (+)[b][br]Use the green dots to make this angle [/b][b]90[/b][math]^\circ[/math][b].[/b][br]Check your work using the protractor.

An acute angle is 1-89[math]^\circ[/math]. A slice of pie or an inequality symbol are examples of acute angles (><).[br][b]Use the green dots to make an acute angle below.[/b][br]Check your work using the protractor.

An obtuse angle is 91-179[math]^\circ[/math]. The roof of a house or the edges of a stop sign are examples of obtuse angles.[br][b]Use the green dots to make an obtuse angle below.[/b][br]Check your work using the protractor.