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