The diameter of a circle is 9 feet. find the radius.

r = 4.5 feet

Step-by-step explanation:

Radius r is half of the diameter d,

d=2r

r=d /2=9 /2=4.5ft

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.

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