If raj calculates the area of a square with a side of 1.2 cm instead of the area of a square with a side of 2.1 cm, then what is the difference between his answers?
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Given : raj calculates the area of a square with a side of 1.2 cm instead of the area of a square with a side of 2.1 cm
To Find : difference between his answers
Solution:
Area with side 1.2 cm = 1.2² cm²
Area with side 2.1 cm = 2.1² cm²
difference between his answers = 2.1² - 1.2²
a² - b² = (a + b)(a - b)
= (2.1 + 1.2)(2.1 - 1.2)
= 3.3(0.9)
= 2.97 cm²
difference between his answers = 2.97 cm²
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