Simply open a position right before or after the of the triangle.
If price breaks through then you simply take the height of the triangle to find your target. In this case, we have a height of about 1,000 pips. If you get a false break open a position in the opposite direction to recover losses.
Note that this strategy has little risk, but anything can happen and the price may not reach the target, so you need to adjust to changing market conditions. I'm simply sharing what I have learned from so many pro traders.
Save this chart for reference if you like.
Good luck :)