A sector of circle of radius 7 2cm which subste... - JAMB Mathematics 2020 Question
A sector of circle of radius 7.2cm which substends an angle of 300\(^o\) at the centre is used to form a cone. What s the radius of the base of the cone?
A
8cm
B
9cm
C
6cm
D
7cm
correct option: a
\(\frac{Q}{360}\) = \(\frac{r}{L}\)
\(\frac{300}{360}\) = \(\frac{r}{7.2}\)
r = \(\frac{300 \times 7.2}{360}\)
= 8cm
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