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Question : An exterior angle of a triangle is 115° and one of the interior opposite angles is 45°. The other two angles are:

Option 1: 65° and 70°

Option 2: 60° and 75°

Option 3: 45° and 90°

Option 4: 50° and 85°


Team Careers360 12th Jan, 2024
Answer (1)
Team Careers360 19th Jan, 2024

Correct Answer: 65° and 70°


Solution :
Given:
$\angle$ACD = 115°, $\angle$BAC = 45°
We know, $\angle$ABC + $\angle$CAB = $\angle$ACD
⇒ $\angle$ABC = 115° - 45°
$\therefore$ $\angle$ABC = 70°
$\angle$ACB + $\angle$BAC + $\angle$ABC = 180°
⇒ $\angle$ACB + 45° + 70° = 180°
$\therefore$ $\angle$ACB = 180° – 70° – 45° = 65°
Hence, the correct answer is '65° and 70°'.

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