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The three angles of a quadrilateral are 60°, 80° and 1200. Find the fourth angle?

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The three angles of a quadrilateral are 60°, 80° and 1200. Find the fourth angle?

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Given three angles = 60°,80°,120°

Sum of the given three angles = 60°+ 80° + 120° = 260°

Sum of the four Interior angles of a quadrilateral = 360°

∴ The fourth angle = 360° — 260° = 100°

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