एक वृत्त की परिधि, उसके व्यास से 16.8cm अधिक है। वृत्त की परिधि ज्ञात करें|
Answers
Given:
- The circumference of a circle is 16.8 cm more than its diameter.
To find:
- The circumference of the circle.
Step-by-step explanation:
Let the radius of the circle is r cm. Then its diameter is 2r cm.
Thus its circumference is 2πr cm.
By the given condition,
2πr = 2r + 16.8
or, 2πr - 2r = 16.8
or, πr - r = 8.4
or, (π - 1) r = 8.4
or, (22/7 - 1) r = 8.4
or, (22 - 7)/7 * r = 8.4
or, 15/7 * r = 8.4
or, r = 8.4 * 7/15
or, r = 3.92
So the circumference of the circle is
= 2 * π * 3.92 cm
= 2 * 22/7 * 3.92 cm
= 24.64 cm
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Find the area and circumfrance of a circle whose radius is 20cm (take π=3.14)
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Answer:
Let the radius of the circle is r cm. Then its diameter is 2r cm.
Thus its circumference is 2πr cm.
By the given condition,
2πr = 2r + 16.8
or, 2πr - 2r = 16.8
or, πr - r = 8.4
or, (π - 1) r = 8.4
or, (22/7 - 1) r = 8.4
or, (22 - 7)/7 * r = 8.4
or, 15/7 * r = 8.4
or, r = 8.4 * 7/15
or, r = 3.92
So the circumference of the circle is
= 2 * π * 3.92 cm
= 2 * 22/7 * 3.92 cm
= 24.64 cm