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A square tile of side 19 cm has a square of side 11 cm cut out of it. What area remains, in $cm^{2}$ ? $(1 9^{2} - 1 1^{2})$

Competition practiceSimplification & Approximation

A230
B240
C250
D260

Step-by-Step Solution

1 9^{2} = 361

and

1 1^{2} = 121

, so 361 − 121 = 240. (Or

(19 + 11) (19 - 11) = 30 \times 8 = 240.

)

Answer: B) 240

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