Stuck on integration

Homework Statement

FInd the volume of the solid that lies within the sphere x^2 + y^2 + z^2 = 1, above the xy plane, and outside the cone z = 3 \sqrt{x^2+y^2}

The Attempt at a Solution

i tried to use rdzdrd(theta) to integrate this question but i can't get it right, i used 0 to 2pi for theta, z is from 3r to sqrt(1-r^2), and r is from 0 to sqrt(1/10), help

$$dV = r^{2}sin(\phi)dr d\theta d\phi$$