So the diameter is 6 and the radius is 3. S= 1/2*3. 14*3 squared = 14. 13.
A: The area of this semicircle is 14. 13.
2。 Oh, the circular flower bed has a radius of 4m and an area of 3. 14*4 square =50.24.
Because the width of the path is 1m, the area of the great circle surrounded by the path is the square of 3. 14 *(4+ 1)= 1
78.5。 The area of the path is 78.5-50.24=28.26.
A: The area of this path is 28.26.
3。 36/360=0. 1 (the central angle of a circle is 360 degrees)
So the sector area is equal to110 of the circle area.
12 divided by110 =120.
Answer: The central angle is 36 degrees, and the area of the circle where the sector with an area of 12 square centimeter is located is 120.
I'm in the middle school math experimental class, that's right.