How many different triangles can you make with side lengths 2 in, 4 in, and 5 inches?

A. 90 degrees b. 45 degrees c. 30 degrees d. 120 degrees

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

The curved part of the figure is the semicircle what is the best approximation for the area of this figure