All squares are trapezium.

In the given figure if $\mathrm{OB}=(2x+4)$ and $\mathrm{OC}=3x+1$, find $x$.

$\mathrm{RICE}$ is a rhombus in the given figure, find $x, y$ and $z$. Justify your answer.

In the given figure $\angle \mathrm{A}=5x-8$ and $\angle \mathrm{B}=3x+4$, find all the angles of the trapezium $\mathrm{ABCD}$ in which $\mathrm{AB}\Vert \mathrm{DC}$ and $\mathrm{AD}=\mathrm{BC}$.

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