A circle and quadrants of the coordinate system Whiteboard exercise Play

An angle and points on the circle Student activity Play

Cartesian coordinate system of the plane Student activity Play

Circles and quadrants Simulation Play

Coordinates of midpoints of line segments Whiteboard presentation Play

Coordinates of midpoints of line segments Class activity Play

Determining the quadrant of the coordinate system Whiteboard exercise Play

Determining the signs of trigonometric functions Student activity Play

Exercises Student activity Play

Figures in the Cartesian coordinate system Whiteboard exercise Play

Figures in the Cartesian coordinate system Student activity Play

Finding the cosine of an angle Whiteboard exercise Play

Finding the sine of an angle lying in the first quadrant Whiteboard exercise Play

Position of the ships Animation Play

Quadrants Whiteboard exercise Play

Quadrants Student activity Play

Reduction formulas for the cosine Animation Play

Reduction formulas for the sine Animation Play

Reduction formulas for the tangent Animation Play

Reduction formulas for trigonometric functions Student activity Play

Sign of values of trigonometric functions Whiteboard exercise Play

The cosine and coordinates of the points Animation Play

The cosine of an arbitrary angle Student activity Play

The cosine – reducing angles Student activity Play

The four quadrants Student activity Play