As per convention:
- the angle at A is named A, the angle at B is named B, and the angle at C is named C
- the side of leght a is the side opposed to A, the side of length b is opposed to B, and the side of length c is opposed to C.
Now just state the law of cosines:
c^2 = a^2 + b^2 - 2ab cos(C)
Also, a^2 = c^2 + b^2 - 2bc cos (A)
And, b^2 = a^2 + c^2 - 2ac cos (B)
He is determined, willing to put in the work day or night, busying himself by using both hands. stubborn too, he sticks to what he knows (his father's saying) and won't budge.
Answer A is right, It is difficult to approach the fire as smoke is accumulating all over the ceiling and the heat is also so great. it is due to the smoke all over that the visibility is also low so the use of portable extinguisher is not required here. special personal protective equipment will be required here.
