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GeoGebraGeoGebra Classroom

Tangents and Angles

Tangent Radius Theorem

Tangent-Radius Theorem

Complete the conjecture: If a line is tangent to a circle, then the measure of the angle from the center is always ______ degrees. Therefore, that line is ______________ to the radius.

Tangent Tangent Angle Theorem

Tangent-Tangent Angle Theorem

An angle created by two tangent lines meeting at the same external point and its associated central angle measure add up to _________ degrees. Therefore, the angles are _____________.