Choose the correct answer

In a ΔABC, If C is a right angle, then

We are given that,

∆ABC is a right-angled triangle at C.

Let the sides of the ∆ABC be

AC = b

BC = a

AB = c

By Pythagoras theorem, where C is the right angle,

(AC)^{2} + (BC)^{2} = (AB)^{2}

⇒ b^{2} + a^{2} = c^{2}

Or,

a^{2} + b^{2} = c^{2} …(i)

Using the property of inverse trigonometry,

Replacing A by and B by ,

Substituting the value of a^{2} + b^{2} from equation (i),

=tan^{-1}

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