The diameter of a semicircle is 2 miles. What is the semicircle's radius?

1 mile

Step-by-step explanation:

The diameter is twice the radius, or

d = 2r

We know the diameter is 2, so we can substitute that in for d

2 =2r

We want to find r, so we need to solve for it. To do that, we need to get r by itself. r is being multiplied by 2. To undo this, divide both sides by 2, since division is the opposite of multiplication

2 / 2 = 2r / 2

The 2s on the right will cancel, and we are left with

1 = r

So, the radius is 1 mile

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false

step-by-step explanation:

answer:   28.56 feet (approx)

step-by-step explanation:

since, triangle abc has measure of angle c equal to 55 degrees, measure of angle abc equal to 90 degrees, and length of bc equal to 20 feet.

we have to find out the measurement of segment ab.

therefore, tan 55° =

but bc = 20 feet.

⇒ tan 55 ° =  

⇒ ab = 20 × tan 55 °

⇒ ab = 20 × 1.42814800674

⇒ ab = 28.5629601348   ≈ 28.56 feet