Question

Ayuda porfavor no entiendo

Answer 1

Respuesta:

   43.96 $cm^{3}$      ;    15.57 $cm^{2}$

Explicación paso a paso:

1 )

R = 2 cm

r = 1 cm

$h = \sqrt{(\sqrt{5})^{2} - (1)^{2} } =\sqrt{5 - 1} = \sqrt{4} =2cm$

$V = \frac{\pi h}{3} [R^{2} +r^{2} + R*r ] = \frac{(\pi)(2) }{3} [ (2 )^{2} + ( 1 )^{2} + (2) (1) ] =\frac{2\pi }{3} [4 + 1 + 2 ] = 6.28 [ 7 ] = 43.96 cm^{3}$

2 )

L = 3

$At = L^{2} \sqrt{3}$

$At = ( 3 )^{2} \sqrt{3} = 9 \sqrt{3} = 9 ( 1.73 ) = 15.57cm^{2}$