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Question

In right angle ABC,B=90o,A=45o, then cos45o=

A
1
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B
2
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C
12
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D
None of above
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Solution

The correct option is A 12
Given A=45o,B=90o
C=45o

A=CAB=BC

Let AB=BC=a

AC=AB2+BC2=a2+a2=2a2=2a

cos45=ABAC=a2a=12

So 12 is correct.

480295_453709_ans_a245b67073324b16bb1fcb14422ca0f4.PNG

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