Math, asked by ta344960, 11 months ago

1. The diameter of a circle is 90 cm less than the circumference. What is the diameter of the circle?
a) 42 cm
b) 44 cm
c) 43 cm
d) 45 cm​

Answers

Answered by Meghananaiduyenne
2

Answer:

option d is correct (45)centimetres

Answered by GulabLachman
1

The diameter of the circle

a) 42 cm

It is given in the question that the diameter of a circle is 90cm less than that of the circumference.

We know that for a circle of radius r, its diamter is 2r and its circumference is equal to 2Пr.

Therefore,

2Пr - 2r = 90

⇒ 2r (П-1) = 90

Taking П as 22/7, П-1 becomes 22/7 - 1 = 15/7

⇒ 2r(15/7) = 90

⇒ 2r = 90*7/15

⇒ 2r = 42

Thus, diameter, 2r = 42cm

Option (a) is correct.

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