Question

12) A spool has a diameter of 3.5 cm. If a string
makes 15 turns around it, what is its length?

please tell answer...plz​

Answer 1

$\huge \sf \underline \red{Answer : }$

$\sf \purple{ \implies \: = 165}$

$\huge \sf \underline \pink{Given : }$

• A spoon has a diameter of 3.5 cm
• string makes 15 turns around it.

$\huge \sf \underline \orange{To \: find : }$

• length

$\huge \sf \underline \blue{solution : }$

$\sf \underline{diameter = 3.5 \: cm}$

$\sf \underline{we \: know \: that \: circumference}$

$\: \: \: \: \: \: \: \: \: \: \: \: \sf{ \boxed{ \underline{ \underline{ \red{ \tt{circumference = \pi \: (d)\:}}}}}}$

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \sf{ \implies \: \pi(3.5)}$

$\: \: \: \: \: \: \: \: \: \: \: \: \sf{ \implies \: circumference = 3.5}$

$\sf \underline{ \: now \: 15 \: turns}$

$\: \: \: \: \: \: \: \: \: \: \: \: \sf{ \implies \: 15 \: turns = 3.5 \times 15}$

$\: \: \: \: \: \: \: \: \: \: \: \: \sf{ \implies \: 15 \: turns = 52.2\pi}$

$\: \: \: \: \: \: \: \: \: \: \: \: \sf{ \implies \: 15 \: turns = 165cm}$

$\: \: \\: \: \: \: \: \: \: \: \: \sf{ \implies \: = 165}$