Visual Math - Circles | Geometry Applications | intro

Circles

An angle formed outside of the circle by the intersection of two secants, two tangents or a tangent and a secant is called an exterior angle of the circle.

Theorems About Chords

Parallel chords in the same circle always cut congruent arcs. The quadrilateral formed is an isosceles trapezoid.

Positions Of Line And Circle In Plane

There are three different positions of a line and a circle in a plane. 1. Line and circle don't have a common point. They don't intersect.

Arc, Chord, Secant and Tangent

An arc is any portion (other than the entire curve) of the circumference of a circle.

Theorems About Tangents

The radius drawn to the point of tangency of a tangent line is perpendicular to the tangent at the point of tangency.

Positions Of Two Circles In A Plane

Each circle is in the exterior region of the other. The distance between the centers of the circles are greater than the sum of their radii.

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