# Isosceles trapezium

Trapezoid YUEB (YU||EB) is isosceles.
The size of the angle at vertex U is 49 degrees.
Calculate the size of the angle at vertex B.

angle EBY:  131 °

### Step-by-step explanation:

$\mathrm{\angle }EBY=18{0}^{\circ }-4{9}^{\circ }=13{1}^{\circ }$

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