A symmetrical triangle is composed of a diagonal falling upper trendline and a diagonally rising lower trendline. As the price moves toward the apex, it will inevitably breach the upper trendline for a breakout and uptrend on rising prices or breach the lower trendline forming a breakdown and downtrend with falling prices.
Traders should watch for a volume spike and at least two closes beyond the trendline to confirm the break is valid and not a head fake. Symmetrical triangles tend to be continuation break patterns, meaning that they tend to break in the direction of the initial move before the triangle formed. For example, if an uptrend precedes a symmetrical triangle, traders would expect the price to break to the upside.
No trade/financial advise.