Relier Pairs Geometry part 1 of circle unit vocabVersion en ligne study geometery circle vocab par Hannah Schmidt 1 Central angles 2 Tangent 3 Point of tangency 4 Chord 5 Secant 6 Radius 7 Diameter 8 Inscribed angle line intersecting a circle twice a line perpendicular to a radius and only touches the circumference once 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 2 points on the circumference and through the center 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