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Tangent triangle missing angles

This math skill involves calculating missing angles in a triangle formed by a radius of a circle and a tangent line. It teaches that the angle between the radius and the tangent is always 90 degrees, and the sum of angles inside the triangle must be 180 degrees.

Learn tangent triangle missing angles

Teaching Transcript

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What do we know about these two angles

A line from the center to a tangent point always meets the tangent at 90 degrees, so we know one angle in the triangle

And the inside angles must sum to 180, so we know that the other two sum to 90 degrees

Skill Practice

Tangent triangle missing angles

Test your understanding of tangent triangle missing angles by practicing it! Work through the below exercises to use it in practice.