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Choose the incorrect statement :...

Choose the incorrect statement :

A

`s=(a+b+c)/2`is called semiperimeter ,in a triangle with sides a,b,c.

B

`(b+c)cosA +(c+a)cosB +(a+b)cosC =a+b+c`

C

in any triangle the sum of two sides is always less than the third side

D

the principal value of `cos^-1 (sqrt3/2) is pi/6`

Text Solution

Verified by Experts

The correct Answer is:
C
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