Find the difference: 6 - 1.455
1 answer:
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Answer:
Step-by-step explanation:
Given
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Required
Determine the area;
Area is calculated as thus:
Substitute values
None of the options answer the question:
Knowing that cos(45°) = 1/√2 is the way forward.
The last step in the equation may not be obious, but the trick here is to multiple numerator and denominator with (1-√2), then the denominator has the special product (a+b)(a-b) = a²-b².
The last step in the equation may not be obious, but the trick here is to multiple numerator and denominator with (1-√2), then the denominator has the special product (a+b)(a-b) = a²-b².