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Sagot :
Answer:
x = 80°
Explanation:
A quadrilateral has sum of total 360° interior angles.
Solve:
30° + 2x + 90° + x = 360°
120° + 3x = 360°
3x = 360° - 120°
3x = 240°
x = 240°/3
x = 80°
Answer:
x = 80°
Step-by-step explanation:
Sum of interior angles of a quadrilateral = 360°
⇒ x + 30° + 2x + 90° = 360°
Collect and combine like terms:
⇒ 3x + 120° = 360°
Subtract 120 from both sides:
⇒ 3x = 240°
Divide both sides by 3:
⇒ x = 80°
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