Trapezoid v3

The isosceles trapezoid has the angle at a firsst base 40 degrees less than the angle at second base. How large angles has this trapezoid ?

Correct result:

a =  70 °
b =  110 °
c =  110 °
d =  70 °


a+b+c+d = 360
a+40 = b

a-d = 0
b-c = 0
a+b+c+d = 360
a-b = -40

a = 70
b = 110
c = 110
d = 70

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