find the unknown angles:
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x = y (Angles opposite to equal sides)
But x + y + 90° = 180°
(Angles of a triangle)
⇒ x + x + 90° = 180°
⇒ 2x + 90° = 180°
⇒ 2x = 180° - 90° = 90°
∴ x = 90°/2 = 45° ∴ y = x = 45°
Hence x = 45°, y = 45°
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x = y
x + y + 90° = 180°
⇒ x + x + 90° = 180°
⇒ 2x + 90° = 180°
⇒ 2x = 180° - 90° = 90°
⇒x = 90/2 = 45
⇒ x = 45°, y = 45°
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