Question

What is the mean of the measures of the three exterior angles of a triangle if two of the interior angles have measures of 63 and 78 degrees?

Answer 1

Answer:

1. Mean score=120

Step-by-step explanation:

1. Areas of a triangle add upto 180degrees (63+78+x=180) 141+x= (x=180-141) x=39
2. Areas on a straight line add upto 180degrees

180-78=102

180-63=117

180-39=141

1. 102+117+141=360
2. Mean=360/3 =120