An arc substends a central angle measuring seven pi over 4 rad what fraction of the circumference is this arc

Which of the following statements is not true? a.parallel lines are lines in the same plane that never intersect. b.congruent figures have the same shape and same size angles and sides. c.similar figures must have the same shape and the same size. d.a rotation is when you turn a figure around a certain point.

Acircle has a diameter will endpoints of (-2,8) and (6, 4). what is the center of the circle

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}