4formulas which include pi. 2 deal with circles and 2 deal with spheres

circle

1. area=π*R square

2.circumference=2πr

sphere

1. curve surface area=4*π*R square

2. volume =4/3*π*R^3

i believe it is c.y = 9x

rise over run. 9 units up over 1 unit right or 9/1

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

hope it