Relier Pairs Geometry part 1 of circle unit vocabVersion en ligne study geometery circle vocab par Hannah Schmidt 1 Radius 2 Secant 3 Diameter 4 Tangent 5 Chord 6 Central angles 7 Point of tangency 8 Inscribed angle a line perpendicular to a radius and only touches the circumference once segment connecting any 2 points on the circumference angle whose vertex IS the center of the circle -the measure of a circle is EQUAL to the measures of the intercepted arc Segment connecting center to circumference segment connecting 2 points on the circumference and through the center angle whose vertex is on the circumference of the circle - The measure of an inscribed angle is HALF of the intercepted arc line intersecting a circle twice the location where the tangent line touches the circumference