Question

calcule a area das figuras supondo as mudanças em cm: ​

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Answer 1

a)

$A=\frac{(5+4).3}{2} \\ A=\frac{27}{2} \\ A=13,5{cm}^{2}$

b)

$A=\frac{(16+4). 6}{2}\\ A=20.3 \\ A=60{cm}^{2}$

c)

Cálculo da altura:

${h}^{2}+{8}^{2}={10}^{2} \\ {h}^{2}+64=100$

${h}^{2}=100-64 \\ {h}^{2}=36 \\ h=\sqrt{36}=6cm$

$A=\frac{(12+4).6}{2}\\ A=16.3 \\ A=48{cm}^{2}$

d)

$A=3.1+8.2 \\ A=3+16 \\ A=19{cm}^{3}$

e)

$A=6.2+2.4 \\ A=12+8 \\ A=20{cm}^{2}$

f)

$Ap=6.10-7.2 \\ Ap=60-14 \\ A=46{cm}^{2}$