a circular railroad-crossing sigh has a radius of 15 inches. which measurement is closest to the area of the sigh in square inches?

The value √10 and √15 are plotted on the number line

Gregory draws a scale drawing of his room. the scale that he uses is 1 cm : 4 ft. on his drawing, the room is 3 centimeters long. which equation can be used to find the actual length of gregory's room?

Pls yall i really need the answer fr fr