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# Error and Estimation

A square plate is of size 15 x 15 cm. correct to the nearest cm. A square of size 3 x 3 cm.(also correct to the nearest cm.) is cut away from one of the corners of the plate. Find the range of value of area of the newly formed plate.

### 1 Answer

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- 翻雷滾天 風卷殘雲Lv 79 years agoFavorite Answer
Rage of the area of the original square plate is:

Max. A = 15.5 x 15.5 = 240.25

Min. A = 14.5 x 14.5 = 210.25

Rage of the area of the cut square plate is:

Max. a = 3.5 x 3.5 = 12.25

Min. a = 2.5 x 2.5 = 6.25

Hence:

Max. A - a = 240.25 - 6.25 = 234

Min. A - a = 210.25 - 12.25 = 198

So the range of area of the newly formed plate is between 198 cm2 and 234 cm2.

Source(s): 原創答案

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