For #1 you know the circumference is 7.85
to find the circumference it is pie times the radius times two However since you are doing it backward first you divide it by pie and then two to get the radius
So the estimate answer would be 1.25 as the radius
#2 for this one you must find the circumference of just the glass and not the outer edge so your radius would be 3. Your answer would then be 28.26.
#3 You quadrupled the radius because the diameter is two times more than the radius but if you square it is more.
