If the three angles of a trapezium are $100 °, 60 ° a n d 40 °$ . find its fourth angle.

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Solution

The sum of all the interior angles in a trapezium is always $360 °$ .
sum of given three angles of a trapezium = $100 ° + 60 ° + 40 ° = 200 °$ .
so, its fourth angle = $360 ° - 200 ° = 160 °$ .

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