Question

V
The semicircle is folded to form a right circular
cone so that the arc PQ becomes the circumference
of the base. Given that the diameter of the semicircle,
PQ, is 10 cm, find

(i) the diameter of the base,

(ii) the curved surface area of
the cone.

Answers are
(i) 2.5
(ii)39.3
​

Answer 1

Answer:

The arc PQ forms the circumference of the circlular base of the cone.

The circumference (C) of a circle is given by:

C+=+%28pi%29D Where D is the diameter and C+=+10cm. Solve this for D:

10+=+%28pi%29D Solve for D.

D+=+10%2Fpi

Step-by-step explanation:

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