# Isosceles trapezium

Trapezoid YSED (YS||ED) is isosceles.
The size of the angle at vertex Y is 17 degrees.
Calculate the size of the angle at vertex E.

Result

angle DES:  163 °

#### Solution:

$\angle DES = 180^\circ - 17^\circ = 163^\circ$ Our examples were largely sent or created by pupils and students themselves. Therefore, we would be pleased if you could send us any errors you found, spelling mistakes, or rephasing the example. Thank you!

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