Sam used wire fencing to form a border around a circular region of his back yard where he wanted to plant grass. If the radius of the circular region was 4 yards, what was the total length of the border rounded to the nearest tenth of a yard?

A. 201.1
B. 50.3
C. 25.1
D. 12.6

answer: a clock

step-by-step explanation:

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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