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?

  1. A.

    44 cm

  2. B.

    46 cm

  3. C.

    48 cm

  4. D.

    49 cm

  5. E.

    Question not attempted

Attempted by 12 students.

Show answer & explanation

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।

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