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