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Two of the exterior angles of a triangle are 158 degrees and 99 degrees Find the third exterior angle, in degrees.

 Jul 19, 2021
edited by SleepIsNeeded  Jul 19, 2021
 #1
avatar+68 
+1

Alright. So we know that the interior angles of a triangle add up to 180 degrees, so we find the interior angles of each angle by subtracting the exterior angle from 180.

 

\(1: 180-158=22\)

 

\(2:180-99=81\)

 

Therefore, 22+81+c(the third angle) must be 180.

 

103+c=180

 

\(\fbox{c=77}\)

 Jul 19, 2021
 #2
avatar+1530 
+2

Read the question again. laugh

 

Third exterior angle = 360 - (158 + 99) = 103º smiley

jugoslav  Jul 22, 2021

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