The first thing to do would be to find how many 1/4 cups are in the 1 cup. Divide 1 by 1/4 and you'd get 4.
Just multiply 2 1/2 by 4 and you get 10
1.RS tangent to circle A and circle B at point R and point S
2.AR is perpendicular to RS, BS is perpendicular to RS
3.AR is parallel to BS
2.Radius are perpendicular to tangent
3. 2 lines perpendicular to the same line are parallel to each other