alleryA rectangular card has perimeter 30 cm and one side 10 cm. How long is the next side?
A10 cm
B5 cm
C15 cm
D20 cm
Answer & Solution
Correct answer: B. 5 cm
1. Two lengths take 20 cm.
2. The two widths share 30 - 20 = 10 cm.
3. Each width is 5 cm.
_Source: Wikipedia, Perimeter (CC BY-SA 4.0, rev 1322108581), Perimeter_
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