Relier Pairs Geometry part 1 of circle unit vocabVersion en ligne study geometery circle vocab par Hannah Schmidt 1 Diameter 2 Point of tangency 3 Radius 4 Chord 5 Central angles 6 Inscribed angle 7 Secant 8 Tangent 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 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 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