The diameter of a circle is 105 cm less than the circumference. What is the…
2015
The diameter of a circle is 105 cm less than the circumference. What is the diameter of the circle?
- A.
44 cm
- B.
46 cm
- C.
48 cm
- D.
49 cm
- E.
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Correct answer: D
Let the diameter of the circle be d cm.
Circumference of the circle = πd cm.
According to the question, diameter is 105 cm less than the circumference.
So, d = πd - 105
Rearranging the equation:
πd - d = 105
d(π - 1) = 105
Now, substitute π ≈ 22/7:
d(22/7 - 1) = 105
d(15/7) = 105
d = 105 × 7 / 15
d = 49 cm
Therefore, the diameter of the circle is 49 cm.
हिन्दी उत्तर:
माना वृत्त का व्यास d सेमी है।
वृत्त की परिधि = πd सेमी होगी।
प्रश्न के अनुसार, व्यास परिधि से 105 सेमी कम है।
अतः, d = πd - 105
समीकरण को पुनर्व्यवस्थित करने पर:
πd - d = 105
d(π - 1) = 105
अब π ≈ 22/7 का मान रखने पर:
d(22/7 - 1) = 105
d(15/7) = 105
d = 105 × 7 / 15
d = 49 सेमी
अतः, वृत्त का व्यास 49 सेमी है।