The law of cosines is:
c² = a² + b² - 2abCos(C)
Therefore, in order to apply this law, we must know the value of two adjacent sides, represented by a and b here, and the value of their subtended angle, represented by C.
C.drawing a card from a deack of cards
As it is straight angle so it's answer will be 180.
Answer: See below
Step-by-step explanation:
Triangle ABC has vertices located at A( 0, 2), B (2, 5), and C (−1, 7)
A)

B) Slope of AB line = m₁=3/2
Slope of BC line = m₂=-2/3
Slope of CA line = m₃=-5
C) 
Therefore, the triangle is a isosceles right angle triangle
Answer:
Step-by-step explanation:
22.75