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प्रश्न
Calculate the unknown marked angles of the following figure :
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उत्तर
We know that the sum of three angles of a triangle is 180°, therefore
In figure,
y + 80° + 20° = 180°
⇒ y + 100° = 180°
⇒ y = 180° − 100° = 80°
Hence y = 80°
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