The circumference of a circle measures 15.7 centimeters. What is the measure of its diameter? a. 12 cm c. 5 cm b. 10 cm d. 2.5 cm Please select the best answer from the choices provided

Grace is standing 18 feet from a lighthouse and kelly is standing 10 feet from grace. the angle that grace looks up to see the top of the lighthouse is 45°. the angle that kelly looks up to see the top of the lighthouse is y°. find the height, h, of the lighthouse. find the angle, rounded to the nearest tenth of a degree, in which kelly looks up to the top of the lighthouse. to the nearest tenth of a degree, find the value of x° . in two or more sentences, explain your calculations