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Question

In the right angled triangle shown below, if AB=3 cm, BC=4 cm then what is the value of cos A?


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Solution

Since ABC is a right angled triangle, we can apply Pythagoras theorem to get the length of side AC (hypotenuse).
Therefore, AC2=AB2+BC2
AC2=32+42
AC2 = 9 + 16 = 25
AC = 25 = 5
AC = 5
Now, cos A = ABAC = 35.

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