The area of ring between two concentric circle is 3168 CM square find the radii of two circle if their sum is 42 cm and their difference is 28 CM
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Concentric circles means their center point is same . Or you may say both are drawn from same point But radius can be different .
This is your answer :)
Given :
Area of ring ( Area of large circle - Area of small circle ) = 3168 cm²
Let the radius of small circle(C1) be r and radius of large circle (C2) be R
It is given that :
R + r = 42 ____(1)
R - r = 28 ____(2)
I think we don't need the area to find out the radius because here are two equations 1 and 2
from 2
R = r + 28
put it in 1
r + 28 + r = 42
2r = 42 - 28
2r = 14
r = 7 cms
R = r + 28
R = 7 + 28
R = 25 cms
hppe its helps
This is your answer :)
Given :
Area of ring ( Area of large circle - Area of small circle ) = 3168 cm²
Let the radius of small circle(C1) be r and radius of large circle (C2) be R
It is given that :
R + r = 42 ____(1)
R - r = 28 ____(2)
I think we don't need the area to find out the radius because here are two equations 1 and 2
from 2
R = r + 28
put it in 1
r + 28 + r = 42
2r = 42 - 28
2r = 14
r = 7 cms
R = r + 28
R = 7 + 28
R = 25 cms
hppe its helps
Answered by
2
Answer:
the answer is i)33cm and 9cm ii)32cm and 4cm
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