# Four sides of trapezoid

In the trapezoid ABCD is |AB| = 73.6 mm; |BC| = 57 mm; |CD| = 60 mm; |AD| = 58.6 mm. Calculate the size of its interior angles.

Result

A =  76.58 °
B =  90 °
C =  90 °
D =  103.42 °

#### Solution:

$C = 180-B = 180-90 = 90 = 90 ^\circ$

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Cosine rule uses trigonometric SAS triangle calculator. See also our trigonometric triangle calculator.

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