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3 years ago

10

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 an

d 78 degrees?

1 answer:

Genrish500 [490]3 years ago

4 0

Answer:

Mean score=120

Step-by-step explanation:

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

180-78=102

180-63=117

180-39=141

102+117+141=360
Mean=360/3 =120

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