Regular pentagon abcde is inscribed in a circle. find arch measure ab. if the radius is 6, find ab.

a. Your answer and reasoning are correct.

b. If O is the center of the circle, then angle ABO has measure 72º, so that by the law of cosines

just to add to the superb reply above by @LammettHash

step-by-step explanation:

hans did not square the 40-unit side; he merely multiplied it by 2.   incorrect.

168

step-by-step explanation:

first off, we know that he drove 3.5 hours at a rate of 48 mph.

knowing that, we want to see how many miles he drove all-together.

in this case, we can just multiply 48 by 3.5.

48 * 3.5 = 168