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Find the value of x in each of the following triangles :

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Find the value of x in each of the following triangles :

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Sum of all angles of a triangle is 180°

(i) 70° + 60° + x = 180°
⇒ 130° + x = 180°
∴ x = 180° – 130° = 50°

(ii) 30° + x + 90° = 180°
⇒ 120° + x = 180°
⇒ x = 180° – 120° = 60°

(iii) 40° + 40° + x = 180°
⇒ 80° + x = 180°
⇒ x = 180° – 80° = 100°

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