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प्रश्न
The length and breadth of a rectangular plot are 5 × 105 and 4 × 104 metres respectively. Its area is ______
विकल्प
9 × 101 m2
9 × 109 m2
2 × 1010 m2
20 × 1020 m2
उत्तर
2 × 1010 m2
Explanation;
Hint:
Area of a rectangle = l × b = 5 × 105 × 4 × 104
= 5 × 4 × 105+4
= 20 × 109
= 2.0 × 10 × 109
= 2 × 1010 m2
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