You find the midpoint by using the formula m=(x1+x2 then divide by 2, and y1+y2 divided by 2) that’s how you find midpoint and the (5,13) 5-x1 13-y1 and so on hope this helps!
Area of the base is πr² where r is the radius. The volume of a cone is ⅓ πr²h where h is the height. So the volume is ⅓ π×9×10=30 π=94.25 cu in approximately.
