If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

## Calculus 2

### Unit 5: Lesson 9

Arc length: polar curves

# Arc length of polar curves

## Problem

Which of the following integrals gives the arc length of the part of the three-petal flower space, r, equals, 2, cosine, left parenthesis, 3, theta, right parenthesis, space pictured above that lies in space, start color #df0030, start text, Q, u, a, d, r, a, n, t, space, I, end text, end color #df0030?