Isosceles trapezium ABCD ABC = 12 angle ABC = 40 ° b=6. Calculate the circumference and area.

Correct result:

o =  26.8075
S =  28.5542


a=12 b=6 B=40  x=b cosB=b cos40 =6 cos40 =6 0.766044=4.59627 c=a2 x=122 4.59632.8075  o=a+2 b+c=12+2 6+2.8075=26.8075
h=b sinB=b sin40 =6 sin40 =6 0.642788=3.85673 S=a+c2 h=12+2.80752 3.8567=28.5542

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