EXTERIOR ANGLES
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» A triangle that has an exterior angle and it is adjacent to one of the interior angles is Supplementary Angles summing to 180°. The other interior angles that are not adjacent to the exterior angles are called remote angles.
#9
[tex] \implies \sf \large 125 \degree + x = 180 \degree[/tex]
[tex]\implies \sf \large x = 180 \degree - 125 \degree[/tex]
[tex]\implies \boxed{\sf \large \purple{x = 55 \degree}}[/tex]
#10
[tex] \implies \sf \large 78 \degree + x = 180 \degree[/tex]
[tex]\implies \sf \large x = 180 \degree - 78 \degree[/tex]
[tex]\implies \boxed{\sf \large \purple{x = 102 \degree}}[/tex]
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