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Question
A greeting card has an area 90 cm2. Between what two whole numbers is the length of its side?
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Solution
| 1 | 90 |
| 5 | 45 |
| 3 | 9 |
| 3 | 3 |
| 1 |
Area of the greeting card = 90 cm2
(side)2 = 90 cm2
(side)2 = 2 × 5 × 3 × 3 = 2 × 5 × 32
`sqrt(("side")^2) = sqrt(2 xx 5 xx 3^2)`
side = `3sqrt(2 xx 5)`
side = `3sqrt(10)` cm
side = 3 × 3.2 cm
side = 9.6 cm
∴ Side lies between the whole numbers 9 and 10.
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