Question

Find the area of Circular Ring if 4 poin
outer diameter D= 38mm,
inner diameter d=32mm
O
340mm2​

Answer 1

$\underline{\pink { Dimensions \: of \: a\:ring : }}$

$i)Outer \: diameter \:of \:the \:ring (D) = 38\:mm$

$Outer \: radius\:of \:the \:ring (R) \\=\frac{D}{2} \\= \frac{ 38}{2} \\= 19 \: mm \: --(1)$

$i)Outer \: diameter \:of \:the \:ring (D) = 38\:mm$

$Outer \: radius\:of \:the \:ring (R) \\=\frac{D}{2} \\= \frac{ 38}{2} \\= 19 \: mm \: --(1)$

$ii)Inner \: diameter \:of \:the \:ring (d) = 32\:mm$

$Inner\: radius\:of \:the \:ring (r) \\=\frac{d}{2} \\= \frac{ 32}{2} \\= 16 \: mm \: --(2)$

$iii) \red{ Area \: of \: Circular \:ring } \\= \pi( R^{2} - r^{2} ) \\= \pi ( R + r )( R - r ) \\= \pi ( 19 + 16 )( 19 - 16 ) \\= \frac{22}{7} \times 35 \times 3 \\= 22 \times 5 \times 3 \\= 330 \: square \: mm$

Therefore.,

$\red{ Area \: of \:the \: Circular \:ring }\\\green { = 330 \: square \: mm}$

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