Rhombus 36

Rhombus ABCD with side 8 cm long has diagonal BD 11.3 cm long. Find angle DAB.

Correct answer:

α =  89.8612 °

Step-by-step explanation:

a=8 cm u=11.3 cm  a=AB=BC=CD=DA α = DAB  u2 = a2 + a2 2 a a cos α  A=arccos(2 a22 a2u2)=arccos(2 822 8211.32)1.5684 rad  α=A  °=A π180   °=1.5684 π180   °=89.861  °=89.8612=89°5140"

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