Question

solve 7th questions.........
.
mr jao dub ke XD
don't take serious... (⌒o⌒)​

Answer 1

$\large{\red{\underline{\underline{\textsf{\maltese\:{\red{Given :}}}}}}}$

$\sf{r=7 c.m}$

$\sf{h=24 c.m}$

$\large{\red{\underline{\underline{\textsf{\maltese\:{\red{To\:Find}}}}}}}$

$\sf{Area \:of\: sheet \:required\: to\: make\: 10 \:such \:caps}$

$\large{\red{\underline{\underline{\textsf{\maltese\:{\red{Solution:}}}}}}}$

$\sf{Let \:slant \:height\: be , l}$

$\sf{We\: know\: that}$

$\sf{l^2= h^2+r^2}$

$\sf{l^2= 24^2+7^2}$

$\sf{l^2= 576 +49}$

$\sf{l^2 = 625}$

$\sf{l= 25\:c.m}$

$\sf{Curved\: surface\: area \:of \:1 \:jokers \:cap = πrl}$

$\sf{= \dfrac{22}{7} \times 7 \times 25}$

$\sf{=22×25}$

$\sf{=550 \:c.m^2}$

$\sf{So, }$

$\sf{Curved\: surface\: area\: of 10\: jokers \:cap}$ $\sf{=10×550}$

$\sf{=5500 \:c.m ^2}$

Answer 2

$\sf\fcolorbox{gray}{white}{\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:Answer\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:}$

$\bold\pink{Given:}$

$\sf\color{navy}{r=7 c.m}$

$\sf\color{navy}{h=24 c.m}$

$\bold\pink{To\:Find:}$

$\sf\color{navy}{Area \:of\: sheet \:required\: to\: make\: 10 \:such \:caps}$

$\bold\pink{Solution:}$

$\sf{Let \:slant \:height\: be , (l)}$

$\sf\color{navy}{We\: know\: that}$

$\sf{l^2= h^2+r^2}$

$\sf{l^2= 24^2+7^2}$

$\sf{l^2= 576 +49}$

$\sf{l^2 = 625}$

$\sf{l= 25\:c.m}$

$\sf\color{navy}{Curved\: surface\: area \:of \:1 \:jokers \:cap = πrl}$

$\sf{= \dfrac{22}{7} \times 7 \times 25}$

$\sf{=22×25}$

$\sf{=550 \:c.m^2}$

$\sf\color{navy}{∴\:Curved\: surface\: area\: of\: 10\: jokers \:cap}$ $\sf{=10×550}$

$\sf{=5500 \:c.m ^2}$

$\sf\color{navy}{Hence,}$

$\sf\color{navy}{The\: curved\: surface\: area\: of\: 10\: jokers \:cap}$ $\sf\color{navy}{is\: 5500 \:c.m ^2}$