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:

DES=18017=163\angle DES = 180^\circ - 17^\circ = 163^\circ



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