YouTube on MSN

Tutorial - Given the cosine of an angle determine the double angle for sine, cosine and tangent

Learn how to evaluate the double angle of sine. The value of the sine of double a given angle can be obtained given the value ...
BBC

Angles in triangles and quadrilaterals

Interior angles in a triangle add up to 180˚. Triangles close triangleA polygon with three straight sides. have three sides, therefore they have three angles. Interior angles in a triangle sum to a ...
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 ...
Hosted on MSN

Geometry Tutorial: Triangles, Congruency & Types

Discusses the properties and types of triangles, explaining that a triangle is a closed figure with three sides and angles. It categorizes triangles into equilateral, isosceles, scalene, obtuse, right ...