Question

QUICK!! Convert r = 8cos θ to rectangular form.

Answer 1

D

to convert from polar to rectangular form use

• cosΘ = $\frac{x}{r}$

• r² = x² + y²

r = 8 × $\frac{x}{r}$ ( multiply both sides by r )

r² = 8x, hence

x² + y² = 8x ← in rectangular form