# Deriving the Equation of Tangents

Students learn how to find the equation of a tangent using the gradient of the radius and touching coordinates.  As learning progresses they apply their learning to prove whether a line is tangential.
##### Differentiated Learning Objectives
• All students should be able to calculate the gradient of a tangential line to a circle.
• Most students should be able to calculate the equation of a line tangential to a circle.
• Some students should be able to use algebra to prove a line is tangential to a circle.
SKU: 142

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