Distance between two polar coordinates help

Two points are given in polar coordinates by (r,θ) = (2.0 m , 35.0°) and (r,θ) = (2.0 m, -30.0°), respectively.

what is the distance between them?

I found the y competent values through trig, and got 2.6 m between the points vertically, yet it says it's still incorrect?

D = dy = y1 - y2 = 2.0*sin35° - (2.0*sin(-30°)) = 2.15 m