Question

What kind of a polar graph is `r=10−10sintheta`?

Answer 1

Cardioid,.Looks like heart symbol, in the game of cards.. We get this cardioid by rotating the cardioid `r = 10 ( 1 + cos theta )`, through `pi/2`, in the clockwise sense, about the pole. ..

Explanation:

This curve is symmetrical about `theta = (3pi)/2`. The right and left halves of this cardioid meet at the pole `(0, pi/2)` above and at `(20, (3pi)/2)`, below.