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