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  • 23-01-2019
  • Mathematics
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What is the area of number 4?

What is the area of number 4 class=

Respuesta :

gmany
gmany gmany
  • 25-01-2019

Answer:

800 cm²

Step-by-step explanation:

Look at the picture.

We have three rectangles. The formula of an area of a rectangle:

[tex]A=lw[/tex]

l - length

w - width

Rectangle I:

[tex]A_I=7\cdot20=140\ cm^2[/tex]

Rectangle II:

[tex]A_{II}=6\cdot20=120\ cm^2[/tex]

Rectangle III:

[tex]A_{III}=18\cdot30=540\ cm^2[/tex]

The area of number 4:

[tex]A=A_{I}+A_{II}+A_{III}[/tex]

Substitute:

[tex]A=140+120+540=800\ cm^2[/tex]

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