if diameter of a circle be 56 cm then find its perimeter . if the perimeter of the circle is trebled then what will be the radius of the new circle
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Answer:
84 cm
Step-by-step explanation:
1st Circle
Diameter = 56cm
Radius = 28cm
(Perimeter of a circle is known as It's Circumference)
Circumference = 2 π r
= 2 × 22/7 × 28
= 2 × 22 × 4
= 176cm
According to Question
The first circle is trebled (×3) and has formed a new circle...
2nd Circle
Circumference = 176 × 3
= 528cm
2 π r = 528cm
2 × 22/7 × r = 528cm
528 × 7
r = -------------
22 × 2
= 84cm
Therefore, the radius of the New circle formed is 84cm.
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