GATE | GATE CS 2020 | Question 9
Two straight lines are drawn perpendicular to each other in X−Y plane. If α and β are the acute angles the straight lines make with the X- axis, then α+β is ________ .
Explanation: According to given question,
Now, as we know that, in a triangle sum of internal angles is equal to 180°.
→ ∠a + ∠b + ∠c = 180° → α + β + 90° = 180° → α + β = 180° - 90° = 90° → α + β = 90°
Option (B) is correct.
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