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Tangent Lines

A straight line outside a circle which just "touches" the circle, and intersects it at exactly one point, is called a tangent line.

The tangent line is perpendicular to the radius at the point where it intersects the circle.

Tangent Line (Geometry Concept)

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Now that we've explained the basic concept of tangent lines in geometry, let's scroll down to work on specific geometry problems relating to this topic.

Tangent Line

Prove that the Tangent is Perpendicular to the Radius

Tangent-secant

Tangent-Secant Theorem

Geometry drawing of a circle with a triangle and tangents.

Tangents to a circle and inscribed angles

tangent line to a circle

Tangent Line to a Circle

two tangent theorem in geometry

The Two Tangent Theorem

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About

Welcome to Geometry Help! I'm Ido Sarig, a high-tech executive with a BSc degree in Computer Engineering and an MBA degree in Management of Technology. I'm here to tell you that geometry doesn't have to be so hard! My goal with this website is to help you develop a better way to approach and solve geometry problems, even if spatial awareness is not your strongest quality. Read More…

Geometry Topics

  • Area of Geometric Shapes
  • Circles
    • Arcs, Angles, and Sectors
    • Chords
    • Inscribed Shapes
    • Tangent Lines
  • Lines and Angles
    • Intersecting Lines and Angles
    • Parallel Lines
    • Perpendicular lines
  • Pentagons and Hexagons
  • Perimeter of Geometric Shapes
  • Polygons
  • Quadrangles
    • Kites (Deltoids)
    • Parallelograms
    • Rectangles
    • Rhombus
    • Squares
    • Trapezoids
  • Triangles
    • Congruent Triangles
    • Equilateral Triangles
    • Isosceles Triangles
    • Pythagorean Theorem
    • Right Triangles
    • Similar Triangles
    • Triangle Inequalities

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