Sketch the solid described by the given inequalities (cylindrical coordinates) 0 ≤ θ ≤ pi/2 and r ≤ z ≤ 2.

Based on your question where as to sketch the solid that is described be the given inequalties(cylindrical coordinates) and and i could only give you this answer r≤z
andr=x2+y2−−−−−−√so we havex2+y2−−−−−−√=z⟹x2+y2=z2which, if you know it, is the equation of a cone notice you can sort of see the pythagorean theorem hidden in it

Could you make it more clear?