4) What is the area of the sector, if the diameter is 12 cm and the angle is 60 Degree?

5) What is the area of the circle, if the circumference of the circle is 44cm?

6) What is the radius of the circle if the angle of sector is 90 Degree and the area of the sector is 196 cm²?

7) What is the area of the sector, whose diameter is 40 mm and angle is 120 Degree?

8) What is the length of arc of a sector, whose radius is 15 cm and angle is 40 Degree?