Respuesta :

mhanifa

Answer:

  • x = 6

Step-by-step explanation:

Since bases are parallel, C and D are supplementary angles:

  • m∠C + m∠D = 180°
  • 20x + 9 + 10x - 9 = 180
  • 30x = 180
  • x = 180/30
  • x = 6
VirαtKσhli

Given :-

  • Bottom sides are parallel .

To find :-

  • The value of x .

Answer :-

As we know that ,

  • Sum of co interior Angles = 180° .

Here ,

  • 20x + 9 and 10x - 9 are co interior Angles.

So that ,

  • 20x + 9 + 10x - 9 = 180
  • 30x = 180
  • x = 180/30
  • x = 6°