1.

In the figure above, `bar(PQ) and bar(RS)` are parallel. `bar(AC)` is transversal of `bar(PQ) and bar(RS)`. If `angle(ACP)=5x-70^(@) and angleBDR=4x+70^(@)`, then find the value of x.

Answer» Given that, `bar(PQ)"//"bar(RS) and bar(AB)` is a transversal.
Aslo given, `angleACP=5x-70^(@) and angleBDR=4x+70^(@)`.
`angleACP+angleBDR=180^(@)` (`:.` Exterior angles on the same side of the transversal.)
`implies 5x-70^(@)+4x70^(@)=180^(@)`
`implies 9x=180^(@)implies x=20^(@)`


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