Isosceles trapezoid

2 opposite sides are parallel and have the same length.
Side length a
Side length b
Height h_a
Side length a
Side length b
Height h_a
Circumfirence U=2(a+b)
Area A=a*h
Diagonal 1 d_1  = \sqrt {a^2  + b^2  + 2*a*sqrt {b^2  - h_b^2 } }
Diagonal 2 d_2  = \sqrt {a^2  + b^2 -2*a*sqrt {b^2  - h_b^2 } }
Angle asin(A/(a*b))
Angle beta=pi-alpha
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