U2C3: Angles and Arcs in Circles Flashcards
how are minor arcs named?
by their endpoints
how are semicircles and major arcs named?
find another point on the arc and name it using the three points
parallel lines and arcs of a circle
when parallel lines intersect a circle, the arcs between the lines are congruent
central angle
an angle with its vertex at the center of the circle
the measure of a central angle equals the measure of its intercepted arc
inscribed angle
an angle that has its vertex on the circle
the measure of an inscribed circle = half the measure of its intercepted arc
when two segments intersect in the middle of a circle
the angle at which they intersect is equal to 1/2 the sum of the intercepted arcs
when two lines intersect outside a circle
the angle at which they intersect will be 1/2 the difference of the intercepted arcs
