All angles in a triangle add up to 180 degrees. So, if you are missing an angle, add up the degrees of the angles present and subtract that from 180. That will be the value of the missing angle in degrees.
V•w = (-7i +4j)•(-6i +5j) = (-7)×(-6) +4×5 = 42 +20
v•w = 62
Answer:
Step-by-step explanation:
40°+31°=71°
trinagle =180°
180°-71°=109
180-109=71°
X=71°
