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Step-by-step explanation:

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Answer:

Step-by-step explanation:

a) angleA + angleB +angleC + angleD =360  

2x + 90 + x + 3x =360

6x = 360-90

6x = 270

x = 45

therefore , x =45 degrees.

b) the same side interior angle are transversal AB between lines AD and BC are supplymentary , so the crossed lines (AD and BC are parallel.

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