Question

to the sum
. The diameters of two circles are 38 cm and 18 cm. Find the diameter of the circle whose
circumference is equal to sum of the circumferences of the two circles.
What is the perimeter of a quadrant OABC of a circle of 7 cm
(C.B.S.E. 2011)
(C.B.S.E. 2011C)
(adjoining figure)?
B

Answer 1

Answer:

The diameter of the circle whose circumference is equal to the circumference of two circles is 56 cm

Step-by-step explanation:

Diameter of circle 1 = 38 cm

Radius of circle 1 =  

Circumference of circle 1 =  

Diameter of circle 2 = 18 cm

Radius of circle 2 =  

Circumference of circle 2 =  

SO, Circumference of two circle =  

We are supposed to find the diameter of the circle whose circumference is equal to the circumference of two circles

So, Let the radius of that circle be R

So,

Diameter of circle =  

Hence the diameter of the circle whose circumference is equal to the circumference of two circles is 56 cm

Step-by-step explanation:mark it as brainliest

Answer 2

Calculate the total circumference by 2*pi*r formula.

It will be equal to 1012/7cm

Now,

1012/7cm=2*22/7*r

Now r will be equal to 46/2=23

Ans:23