A triangle forms when a market's swings compress — each rally weaker or each dip shallower — squeezing price between two converging lines. Volatility contracts, positions build on both sides, and the eventual escape releases the stored energy. Triangles are the chart's version of a coiled spring, and they come in three variants whose slopes tell you who's winning the squeeze.

The three triangles

Ascending: flat resistance on top, rising lows below. Buyers grow more aggressive each swing while sellers defend one price. Statistically biased to break up — the classic bullish continuation shape in uptrends.

Descending: flat support below, falling highs above. Sellers press lower each swing into a defended floor; biased to break down.

Symmetrical: both lines converge — lower highs and higher lows. Genuinely two-sided compression with no strong directional bias; the prevailing trend before the triangle is the best tiebreaker (continuation is more common than reversal).

The bias is a lean, not a law — ascending triangles do break down, and those failures move fast precisely because they surprise. Trade the break, not the forecast.

How to trade a triangle

This is a specialized case of the breakout strategy, and the same rules carry over:

• Wait for a candle close beyond the triangle line — wicks through converging lines are constant and meaningless
• Prefer breaks in the first two-thirds of the triangle's length; patterns that drift into the apex tend to fizzle out sideways rather than explode
• Volume signature: contracting through the pattern, expanding on the break — the textbook confirmation
• Entry: on the breakout close, or on the retest of the broken line (role reversal, tighter stop)
• Stop-loss: inside the triangle, beyond the most recent swing within it
• Target: the measured move — the triangle's widest height projected from the breakout point; partials there

Reading the squeeze before the break

Two tells improve your odds of picking the side early: where price sits in the final third (hugging the flat line it's about to break is constructive — e.g. pressing against ascending-triangle resistance), and the character of the small candles (repeated hammers at the rising lows show who's absorbing). A triangle forming after a strong impulse usually resolves with that impulse — at which point it's close cousin to the bull flag.

Practice it

Triangles look effortless in hindsight because hindsight picks the winning line. In chart replay, draw both lines while the pattern is still forming — future hidden — commit to your levels, then let the break happen to you. Fifty replayed triangles per the backtesting method will calibrate the two judgment calls that matter: which compressions are real, and when a wick is a fake-out.

FAQ

Are ascending triangles always bullish?

Biased bullish, not guaranteed — a meaningful minority break down, and hard. The bias earns you a lean; the entry still waits for the closing break in either direction.

How reliable are triangle patterns?

Well-formed triangles (3+ touches per line, volume contraction, break before the apex) resolve in the measured-move direction in a solid majority of cases. Sloppy two-touch "triangles" drawn onto noise are a coin flip. Pattern quality is most of the reliability.

What's the difference between a triangle and a wedge?

Both converge, but a wedge's lines slope the same direction (both up = rising wedge, bearish lean; both down = falling wedge, bullish lean), while triangle lines oppose or one stays flat. Wedges are usually reversal shapes; triangles usually continuation.