The 3 by 3 grid below shows nine
1
cm
×
1
cm
squares and uses
24
cm
of wire.
What length of wire is required for a similar 20 by 20 grid? Answer must be 420, 421, 441, 800 or 840 cm
Answers
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The 3 by 3 grid below shows nine 1 cm × 1 cm squares and uses 24 cm of wire.
Step-by-step explanation:
A 3×3 grid using 24 units of wire will be made from 4 horizontal and 4 vertical segments of 3 units each.
8×3=24
A 20×20 grid will use 21+21=42 segments of 20 units each, therefore the answer is 840 cm.
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