It is known that the radius of circle A is equal to the diameter of circle B, and the sum of their areas is 100 cm2. Find the area of circle a ..

The circumference of the circular lawn is 50.24 meters. How many square meters does this lawn occupy? (accurate to 1 m2)

I saw the biggest circle on a rectangular board with a length of five meters and a width of four meters. What is the remaining circuit board area? (accurate to 0.0 1 square decimeter)

4. The circular flower bed is 4m in diameter, and a 1m-wide path is paved along the outside to find the area of the path. Accurate to 0. 1 m2