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In a particular circle what is the ratio of its area to its circumfere

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In a particular circle what is the ratio of its area to its circumfere  [#permalink]

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New post 24 Aug 2018, 04:21
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In a particular circle what is the ratio of its area to its circumference?

(1) The radius of the circle is 10 units.
(2) The area of the circle is 100π square units.

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Re: In a particular circle what is the ratio of its area to its circumfere  [#permalink]

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New post 24 Aug 2018, 04:30
Bunuel wrote:
In a particular circle what is the ratio of its area to its circumference?

(1) The radius of the circle is 10 units.
(2) The area of the circle is 100π square units.
Simplified question stem - - > what is the radius of the circle.

Both statements individually gives us the radius.

D

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Re: In a particular circle what is the ratio of its area to its circumfere  [#permalink]

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New post 24 Aug 2018, 04:32
Bunuel wrote:
In a particular circle what is the ratio of its area to its circumference?

(1) The radius of the circle is 10 units.
(2) The area of the circle is 100π square units.


To determine:- \(\frac{Area}{circumference}\)

St1:- r=10 unit
hence both area and circumference can be determined, subsequently ratio can be computed.
Sufficient.

St2:-The area of the circle is 100π square units
Radius can be determined if area is known.
So,circumference can be determined, subsequently ratio can be computed.
Sufficient.

Ans. (D)
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Re: In a particular circle what is the ratio of its area to its circumfere  [#permalink]

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New post 24 Aug 2018, 09:27

Solution


Given:
    • We are given a circle

To find:
    • The ratio of the area of circle to its circumference

Approach and Working:
    • Area/ Circumference = r/2

Analysing Statement 1
    • We are given r = 10
    • Thus, the ratio = 10/2 = 5
Therefore, Statement 1 alone is sufficient to answer this question

Analysing Statement 2
    • Area = 100ᴨ, implies ᴨr2 = 100ᴨ
    • Thus, r = 10
Therefore, Statement 2 alone is sufficient to answer this question.

Hence, the correct answer is option D.

Answer: D

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