2. Find the circumference of the following.
A circle with radius 63 cm
b. A circle with diameter 8.4 m
Answers
2) A) circle with radius 63 cm ..
\bold \orange{given:-}given:−
\fbox \green{.given \: radius \: is \: 63 \: cm}
.givenradiusis63cm
\mathfrak \red{solution:-}solution:−
\bold \purple{let \: the \: radius \: be \: r}lettheradiusber
\bold \blue{so \: c = 2 \: \pi\: r}soc=2πr
\bold \orange{ = 2 \times \frac{22}{7} \times 63}=2×
7
22
×63
\bold \green{ = 44 \times 9}=44×9
\fbox \red{ = 396 \: cm.}
=396cm.
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2) B) A circle with diameter 8.4 m
\bold \orange{given:-}given:−
\fbox \green{.given \: diameter \: is \: 8.4\: m}
.givendiameteris8.4m
\huge \fbox \pink{we \: know \: that:-}
weknowthat:−
\bold \red{r = \frac{diameter}{2} }r=
2
diameter
\bold \gray{ = \frac{8.4}{2} }=
2
8.4
\fbox \blue{now \: radius \: is \: 4.2 \: m}
nowradiusis4.2m
\bold \orange{so \: c = 2\pi \: r}soc=2πr
\bold \green{ = 2 \times \frac{22}{7} \times 4.2}=2×
7
22
×4.2
\bold \purple{ \frac{44}{7} \times 42}
7
44
×42
\bold \gray{ \frac{184.8}{7} }
7
184.8
\fbox \red{26.4 \: m}
26.4m
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