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A rectangle of length a and width b has perimeter:
A2(a - b)
B4(a + b)
Ca x b now
D2(a + b)
Answer & Solution
Correct answer: D. 2(a + b)
1. A rectangle has two lengths and two widths.
2. Adding them gives a + b + a + b.
3. So the perimeter is 2(a + b) units.
4. The answer is 2(a + b).
_Source: NCERT Class 9 Mathematics, Ch 6 'Measuring Space: Perimeter and Area'_
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