Is ab perpendicular to cd ? explain.

Sketch the vector field vector f( vector r ) = 8vector r in the xy-plane. select all that apply. the length of each vector is 8. the lengths of the vectors decrease as you move away from the origin. all the vectors point away from the origin. all the vectors point in the same direction. all the vectors point towards the origin. the lengths of the vectors increase as you move away from the origin.

Which radical expression is a rational number? a. √ 360 b. √ 644 c. √ 225 d. √ 122

Geometry - finding area of regular polygons and sectors (check my math, i can’t find the error)