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3 years ago

10

QUICK!URGENT HELP PLEASE!20 POINTS

1 answer:

tino4ka555 [31]3 years ago

4 0

Answer:

840

Step-by-step explanation:

The 3 by 3 grid below shows nine 1 cm x 1 cm squares and uses 24cm of wire

24 cm of wire

is 3 (3 + 1) + 3(3 + 1)

= 3 x 4 + 3 x 4

= 12 + 12

= 24 cm

length of wire is required for a similar 20 by 20 grid

= 20(20 + 1) + 20(20 + 1)

= 20 x 21 + 20 x 21

= 420 + 420

= 840 cm

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