Trapezoid v3

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

Correct answer:

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

Step-by-step explanation:


a=d
b=c
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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