MCQ
In Quadrilateral $ABCD, \angle\text{A} = (3\text{x})^\circ, \ \angle\text{B} = (5\text{x})^\circ,\ \angle\text{C} = (20\text{x})^\circ,\ \angle\text{D} = (8\text{x})^\circ.$ Find the value of $x?$
  • A
    $11$
  • $10$
  • C
    $20$
  • D
    $9$

Answer

Correct option: B.
$10$

$\angle\text{A} + \angle\text{B} + \angle\text{C} + \angle\text{D} = 360 ($angle sum property$)$
$3x + 5x + 20x + 8x = 360$
$36x = 360$
$x = 10$

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