Before radar and sonar, sailors would climb to the top of there ships to watch for land or changes in weather if the lookout at the top of the mast can see D= 5/6 h

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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the answer is c: divide the arc's degree measure by 360°, then multiply by the circumference of the circle.