Mathematics
JAMB 1984
A cone is formed by bending a sector of a circle having an angle of 210
o. Find the radius of the base of the cone if the diameter of the circle is 12cm.
-
A.
12cm
-
B.
7.00cm
-
C.
1.75cm
-
D.
21cm
-
E.
3.50cm
Correct Answer: Option E
Explanation
If diameter of the circle = 12cm; radius of the circle(L) = \(\frac{12}{2}\)
= 6cm
\(\frac{\theta}{360}\) = \(\frac{r}{L}\) where \(\theta\) = 210\(\theta\), L = 6cm
\(\frac{210}{360}\) = \(\frac{r}{6}\)
where r = radius of the base of the cone
V = \(\frac{1260}{360}\)
= 3.50cm
Report an Error
Ask A Question
Download App
Quick Questions
Contributions ({{ comment_count }})
Please wait...
Modal title
Report
Block User
{{ feedback_modal_data.title }}