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AlgebraHigher

Equation of a tangent to a circle

The radius is drawn to the point on the circle. Find its gradient, take the negative reciprocal for the tangent, then use the point to find c. Then points in other quadrants, where the tangent crosses the x axis and the area of the triangle it makes with the axes.

A free GCSE Higher algebra lesson on equation of a tangent to a circle, spec code A16. It has a lesson deck to teach from with a visualiser, a worksheet with answers, a puzzle, an exit ticket and an end of unit test.

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