There are 15 troop members. 10 like to fish. The probability that the new guy is paired with a guy who likes fishing is 10/15, which is 67%
Answer: The measure of the vertex angle = 80°
Step-by-step explanation:
Angle sum property of triangle : The sum of the measures of the angles for any triangle is 180 degrees.
So,
'
Then, vertex angle = 
Hence, The measure of the vertex angle = 80°