YouTube on MSNOpinion

Learning to apply the law of cosines when given one obtuse angle

Learn how to solve for the lengths of the sides and the measures of the angles of a triangle using the law of cosines. The ...
YouTube on MSNOpinion

Determine the sides of a triangle produce an acute, obtuse or right triangle

Learn about the Pythagorean theorem. The Pythagoras theorem is a fundamental relation among the three sides of a right ...
PBS

Acute and Obtuse Angles - Jill Turner - Fourth Grade

Adjust the colors to reduce glare and give your eyes a break. Use one of the services below to sign in to PBS: You've just tried to add this video to My List. But first, we need you to sign in to PBS ...
BBC

Drawing and measuring angles

A protractor is used to draw and measure angles. An angle is the amount of turn between two lines. Angles are measured in degrees with the symbol °. Angles can be labelled with 3 letters (eg DEF) to ...
BBC

Compare and order angles

An angle is the space between two lines that start at the same point. This point is called the vertex. Angles measure the size of a turn in degrees. You can show degrees using the symbol ° after the ...