The sum of the angles in the polygons Whiteboard exercise Play

The sum of the angles in the quadrilateral Whiteboard exercise Play

The sum of the angles in the triangle Whiteboard exercise Play

The sum of the angles in the triangle Animation Play

The sum of the exterior angles Animation Play

The sum of the exterior angles of a convex pentagon Animation Play

The sum of the exterior angles of a convex polygon Student activity Play

The sum of the exterior angles of a hexagon Whiteboard exercise Play

The sum of the exterior angles of a pendecagon Whiteboard exercise Play

The sum of the interior angles in the polygons Whiteboard exercise Play

The sum of the interior angles of a quadrilateral – proof Animation Play

The tangent and coordinates of the points Animation Play

The tangent and cotangent functions revisited Student activity Play

The tangent and the cotangent are inversely proportional Student activity Play

The tangent as a coordinate Animation Play

The tangent function Whiteboard exercise Play

The tangent of an arbitrary angle Whiteboard exercise Play

The tangent of an arbitrary angle Student activity Play

The tangent theorem – solving problems Whiteboard exercise Play

The tangent – reducing angles Whiteboard exercise Play

The tangent – reducing angles Student activity Play

The transversal and angles Whiteboard exercise Play

The transversal and angles Student activity Play

The trigonometric functions of the angle 90° Animation Play

The two sides and an angle between them Whiteboard exercise Play