Mathematics
Grade-7
Easy
Question
A circular hoop has a radius of 40 cm. Find the length of tubing needed to make the hoop.
- 125.5
- 251.2
- 230
- 156
Hint:
The distance around the circle is the circumference.
The circumference of the circle is 2 x 
adius
The correct answer is: 251.2
The length of the tubing is the circumference.Let the circumference be C and radius r
Radius,r =40cm
The circumference of the circle is 2 x adius
C = 2 x ∏ x r,
C = 2×3.14×40,
C = 251.2 cm.
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