Current location - Plastic Surgery and Aesthetics Network - Wedding supplies - There are two semicircular carpets on the stage of the Spring Festival Evening. Their circumference is 25.7 meters. What is the total area of these two carpets?
There are two semicircular carpets on the stage of the Spring Festival Evening. Their circumference is 25.7 meters. What is the total area of these two carpets?
The circumference of a semicircle = the length+diameter of semicircle = pi× r+2r = 25.7m, and the radius r = 25.7/(3.14159+2) = 5m. Two semi-circular carpets are spliced into a whole circle with a total area of pi× r× r = 3.65438+.