Question

The graph of a limacon curve is given. Without using your graphing calculator, determine which equation is correct for the graph.

[-5, 5] by [-5, 5]

A. r = 2 + 3 cos θ
B. r = 3 + 2 cos θ
C. r = 2 + 2 cos θ
D. r = 4 + cos θ

Answer 1

B

Explanation:

r = 3 + 2 cos θ

Answer 2

B

Explanation:

r = a + b cos(theta)

1 < a/b < 2

In B, a/b is 3/2

Which is between 1 and 2