Step-by-step explanation:
Sum of the interior angles of a polygon = 10 right angles 10 × 90° = 900°
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But sum of the interior angles of the polygon
= (2n – 4) right angles
i.e. 900 (2n-4) × 90°
→ 180n 360 = 900
⇒ 180n 900 + 360
⇒ 180n = 1260
⇒n=7
Hence the required number of sides = 7
