Relier Pairs Geometry part 1 of circle unit vocabVersion en ligne study geometery circle vocab par Hannah Schmidt 1 Inscribed angle 2 Chord 3 Diameter 4 Central angles 5 Tangent 6 Radius 7 Secant 8 Point of tangency Segment connecting center to circumference the location where the tangent line touches the 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 line intersecting a circle twice 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