Opposite sides are parallel, opposite angles are equal, no curves (only straight lines), there are only 4 sides, and 4 angles,
The formula for a cone is

insert 20 for your height and rearrange the formula to find the radius. Leave a comment if you need more help.
Answer:
5/2
Step-by-step explanation:
2 x 2/5 = 4/5
4 x 1/5 = 4/5
Answer:
5,3
Step-by-step explanation: