Question

porfavor hallar el resultado lo mas facil posible

Answer 1

a) Como sabemos:   $A=\frac{d^{2} \pi}{4}$, $L=2\pi r$

$A=\frac{14^{2}\pi}{4} =49\pi\:cm^{2} <> 153.86\:cm^{2} \\\\L=2.\pi .7=14\pi \:cm <> 43.96\:cm$

b)

$A=\frac{12^{2}\pi }{4}=36\pi\:cm^{2}<>113.04\:cm^{2} \\\\L=2.\pi .6=12\pi \:cm<> 3.768\:cm$

c) Se tiene:   $A=\pi.r^{2}$

$A=\pi .5^{2} =25\pi \:cm^{2}<>78.5\:cm^{2}\\\\L=2.\pi.5=10\pi\:cm<>31.4\:cm$

d)

$A=\pi.r^{2} \\40=\pi.r^{2}\\r=\sqrt{\frac{40}{\pi } } \\r=\frac{2\sqrt{10\pi }}{\pi }\:cm <>3.57\:cm$