Triangle Sight

Measure what you cannot walk to — sine, cosine, and tangent.
Level 1
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Name the sides

Which side is opposite the gold angle?

θ gold angle O opposite A adjacent H hypotenuse
Sightline tip: Opposite sits across from the gold angle. Adjacent touches it. Hypotenuse is the long side, across from the right angle.

Keyboard: 1–3 choose an answer. Enter checks. L opens the Triangle Lab.