Question

me ajudem nessas perguntas de matemática por favor

Answer 1

A) 8+4+1+2+4+2 = 21

B) 5+12+3+4+8+9 = 41

Answer 2

Boa noite Eduardo

Solução!

Vamos usar essa formula para calcular o volume de madeira,já que as peças tem o formato de um cilindro.

$V= \pi .r^{2}.h$

Peça A

$r_{1}=4 ~~~~h_{1}=4 \\\\r_{2}=2~~~~h_{2}=2 \\\\ r_{3}=1~~~~h_{1}=1$


$V_{t}= \pi .(4)^{2} .4+ \pi (2)^{2}.2 + \pi 1(1) ^{2} \\\\\\ V_{t}=\pi .16 .4+ \pi 4.2+ \pi 1.1\\\\\\ V_{t}=64 \pi +8 \pi +1 \pi \\\\\\ V_{t}= \pi (64+8+1) \\\\\\ V_{t}= \pi 73cm^{3}$



$\boxed{ \boxed{Resposta:V_{t}=\pi73cm^{3}}}$




Peça B


$r_{1}=2,5~~~~h_{1}=12\\\\ r_{2}=1,5~~~~h_{1}=4 \\\\ r_{3}=4,5~~~~h_{3}=8$



$V_{t}= \pi (2,5)^{2}.12+ \pi .(1,5)^{2}.4+ \pi .(4,5)^{2}.8 \\\\\ V_{t}= \pi .6,25.12+ \pi.2,25.4+ \pi .20.25.8 \\\\\\ V_{t}=75 \pi +9 \pi +162 \pi \\\\\\ V_{t}= \pi (75+9+162) \\\\\\V_{t}= \pi 246cm ^{3}$



$\boxd{\boxed{V_{t}=\pi246 cm ^{3}}}$


Boa noite!
Bons estudos!