Question

Help please?
Regular pentagon ABCDE rotates counterclockwise about its center to yield pentagon A'B'C'D'E'. At which angle of rotation does A' coincide with D?

Answer 1

320°

288°

216°

144°

72°
I think it is 72 but I am not sure

Answer 2

@Janu16 do you mind checking my answer?

Answer 3

Hint: a --->b' = 72 degrees

Answer 4

3 x 72 = 216

Answer 5

@welshfella Oh... so 216?

Answer 6

that's the answer

Answer 7

right

Answer 8

@welshfella @Joshtray Thank you so much!

Answer 9

can you see why?

Answer 10

yw

Answer 11

welcm

Answer 12

Because 360 degrees and the origin divided by 5 are 72? and 72 x 5 is 126

Answer 13

72 * 3 = 216 you mean...