Question : Find the area of the sector of a circle with a radius of 5 cm and an angle of 60° (rounded off to one decimal).

Option 1: 12.8 cm²

Option 2: 14.1 cm²

Option 3: 13.1 cm²

Option 4: 15.1 cm²

Question : The area of a sector of a circle of radius 28 cm is 112 cm². Find the length of the corresponding arc of the sector.

Option 1: 4 cm

Option 2: 8 cm

Option 3: 6 cm

Option 4: 5 cm

Question : If the side of an equilateral triangle is 8 cm, then find the area of the triangle (correct to two decimal places).

Option 1: 27.17 cm²

Option 2: 27.27 cm²

Option 3: 27.71 cm²

Option 4: 27.72 cm²

Question : The external diameter of an iron pipe is 20 cm and its length is 12 cm. If the thickness of the pipe is 1 cm, find the surface area of the pipe (take $\pi=\frac{22}{7}$ ) correct to two places of decimal.

Option 1: 1,662.67 cm²

Option 2: 1,552.57 cm²

Option 3: 1,442.48 cm²

Option 4: 1,772.76 cm²

Question : The curved surface area of the sphere is 154 cm². Find the volume of the sphere (rounded off to one digit after decimal).

Option 1: 156.9 cm³

Option 2: 179.7 cm³

Option 3: 161.1 cm³

Option 4: 147.8 cm³