Geometry Help!!

Question

Four points A, B, C, and D, lie on a circle with a circumference of 20 units. Point B is 7 units counterclockwise from point A. Point C is 4 units clockwise from point A. Point D is 10 units clockwise from point A and 10 units counterclockwise from point A. Moving clockwise and starting at point A, in what order are the points arranged?

Answer 1

the circle can be described by the equation x^2 + y^2 = r^2 with center at the origin

and radius = r

the circumference = 20 = 2pi(r)

r = 20/2pi = 10/pi = about 10/3.14 = 3.183

x^2 + y^2 = r^2 = (10/pi)^2 = about 10.13

A is (10/pi, 0) = about (3.18, 0)

D is (-10/pi, 0) = about (-3.18, 0)

C is about ( .98, 3.03)

B is about (-1.88, 2.58)

plot the points

going clockwise from A around the circumference goes to C, then D, then B

ACDB