The ratio of circumference and area of a circle is 2:7. what is the
circumference ? (@=pie)
(A) 14@(B)7/@ (C) 7@ (D) 14/@
Answers
Answered by
3
Answer:
GIVEN BY RATIO:-
circumference:area = 2 : 7
\begin{lgathered}area = \pi {r}^{2} \\ circumference \: = 2\pi \: r \\ according \: to \: question \\ \frac{2\pi \: r}{\pi {r}^{2} } = \frac{2}{7} \\ \frac{1}{r} = \frac{1}{7} = r = 7 \\ circumference \: (2\pi {r}^{2} ) \\ 2\pi \times 7 = 14\pi\end{lgathered}
area=πr
2
circumference=2πr
accordingtoquestion
πr
2
2πr
=
7
2
r
1
=
7
1
=r=7
circumference(2πr
2
)
2π×7=14π
hence,your right answer is option (A) 14π
Similar questions