Answer:
Area of trapezium \[=\frac{1}{2}\,h(a+b)\] \[\Rightarrow \] \[34=\frac{1}{2}\,\times 4\,(10+b)\] \[\Rightarrow \] \[34=2\times (10+b)\] \[\Rightarrow \] \[10+b=\frac{34}{2}\] \[\Rightarrow \] \[10+b=17\] \[\Rightarrow \] \[b=17-10\] \[\Rightarrow \] \[b=7\,cm\] Hence, the length of another parallel side is 7 cm.
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