What's the equation for circle that has (8,2) and radius of 25

Suppose i flip two identical coins. what is the probability that i get one head and one tail?

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

The height of a flare fired from the deck of a ship in distress can be modeled by h(t)= -2(8t^2-52t-28), where h is the height of the flare above water and t is the time in seconds. a. find the time it takes the flare to hit the water.