What it means
Triangles form when price consolidates inside converging trendlines. Three variants: ascending triangle (horizontal resistance, rising support — typically bullish continuation), descending triangle (horizontal support, falling resistance — typically bearish), symmetrical triangle (both trendlines converging — direction-neutral until break). Volume contracts through the formation; breakouts come with volume expansion. Measured target = the widest part of the triangle projected from breakout.
Why it matters
Triangles are where dominant strategies form their entries. They represent a tightening trading range — buyers and sellers reaching equilibrium, with the eventual break revealing the dominant side. The pre-break price action reveals which side is accumulating: ascending = buyers absorbing supply at horizontal resistance, descending = sellers absorbing demand at horizontal support.
How to use it
Wait for the triangle to mature — minimum 5 touches across the two trendlines, ideally 8+ before treating as tradeable. Volume should contract through the formation. Break confirmation: daily close beyond the trendline with volume ≥30% above 20-day average. Stop on the opposite side of the triangle. Measured target = widest part of triangle (early in formation) projected from breakout.
BTC March-April 2024: descending triangle with horizontal support at $60,000 and falling resistance from $73,800 high. Volume contracted through the formation. Break below $60,000 in late April with volume expansion confirmed; measured target = $13,800 (height) projected = $46,200. Actual low August 2024: $49,000.
Three variants — ascending, descending, symmetrical
(1) Ascending: horizontal upper trendline, rising lower trendline — buyers willing to pay higher prices to absorb supply at horizontal resistance. Bullish bias, breaks higher 73% of the time per Bulkowski. (2) Descending: horizontal lower trendline, falling upper trendline — sellers absorbing demand at horizontal support. Bearish bias, breaks lower 64% of the time. (3) Symmetrical: both trendlines converging. Direction-neutral; the eventual break direction depends on the prior trend (60% continuation, 40% reversal).
Volume signature — the confirmation filter
Healthy triangle: volume declines steadily through the formation as the range contracts. The break should come with volume ≥30% above the 20-day average. If the break comes on weak volume, false-break rate jumps from ~25% to ~55%. Many failed triangles have flat-volume breaks — the trader without a volume filter trades all of them and loses the edge.
Time-based exhaustion — the 75% rule
Empirically, triangles break out before reaching the apex of the converging trendlines. Bulkowski's rule: most triangles break between 60-75% of the way from the start to the apex. Triangles that drift past 80% of the apex without breaking tend to fizzle into a 'failed pattern' — price exits without a clean directional move. Time the trade: if the triangle is approaching the apex without a break, reduce position size or skip the setup entirely.
Frequently asked
What's the difference between a triangle and a pennant?
Same geometric shape (two converging trendlines). Difference: triangles are 1-3 months in duration and form as primary consolidations. Pennants are 1-4 weeks and form as continuation patterns after a sharp directional move (the 'flagpole'). Pennants are more reliable as continuation; triangles can resolve either way.
How many trendline touches do I need?
Minimum 2 touches per trendline (4 total) to define the triangle. Higher reliability with 5+ touches total. Patterns with only 2 touches on one side are weak — the trendline isn't well-established and false breaks are common.
Are symmetrical triangles bullish or bearish?
Direction-neutral by themselves. Statistical bias: 60% of symmetrical triangles break in the direction of the PRIOR trend (continuation). For a fresh setup with no prior trend context, treat the symmetrical triangle as a 50/50 — wait for the break, don't anticipate.
Can the apex itself be a tradeable level?
Yes — once the triangle fails (price exits past 80% of the apex without breaking either trendline), the apex itself often becomes a magnet level for several months. Range trades around the apex price are common in stocks that exit a triangle without committing.
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