The diagram shows a piece of paper in the shape of a quadrant with centre $O$ and radius $28$ cm

Question

The diagram shows a piece of paper in the shape of a quadrant with centre $O$ and radius $28$ cm.
If a right cone is obtained by placing $OA$ and $OB$ together, find

the curved surface area of the cone in terms of $\pi$,
[1]
the base radius of the cone.
[2]

(Volume of Cone $ = \frac{1}{3}\pi r^2h$, Curved Surface Area of Cone $= \pi r l$)

Accepted Answer

(i) $196\pi\text{ cm}^2$; (ii) $7\text{ cm}$.

2023 EOY Sec 2 ACSI P1 Q4

2023 EOY Sec 2 ACSI P1 Q4

Solution:

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