Amy will place a ball on top of a pillar in Diagram below. Table below shows the diameters of three balls X, Y and Z.
Which ball X, Y or Z, can fit perfectly on the top of the pillar? Show the calculation to support Amy’s choice.
Diagram below shows a rim of a bicycle wheel with a diameter of 26 cm. Kenny intends to build a holder for the rim.
Which of the rim holder, X, Y or Z, can fit the bicycle rim perfectly? Show the calculation to support your answer.