Line segment cd is shown on a coordinate grid: a coordinate plane is shown. line segment cd has endpoints 1 comma 2 and 1 comma negative 1. the line segment is rotated 90 degrees counterclockwise about the origin to form c'd'. which statement describes c'd'? a) c'd' and cd are equal in length. b) c'd' is parallel to cd. c) c'd' is half the length of cd. d) c'd' is greater than twice the length of cd.

Really need on these. i have no idea what to do

Circle a has a diameter of 7 inches, a circumference of 21.98 inches, and an area of 38.465 square inches. the diameter of circle b is 6 inches, the circumference is 18.84 inches, and the area is 28.26 square inches. part a: using the formula for circumference, solve for the value of pi for each circle. (4 points) part b: use the formula for area and solve for the value of pi for each circle. (4 points)

Two lines intersect and two of the vertical angles measure 115°. what is the measure of the other two vertical angles? 65° 85° 90° 245°