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12 cards from this deck
Same fundamental rules as 2D
Visualising problem & identifying triangles
Create right triangle → 2D sketch → Use trig
Create a right-angled triangle
Draw a 2D sketch and mark lengths
Use appropriate trig ratio (sin, cos, or tan)
a2+b2=c2a^2 + b^2 = c^2a2+b2=c2
asinA=bsinB=csinC\frac{a}{\sin A} = \frac{b}{\sin B} = \frac{c}{\sin C}sinAa=sinBb=sinCc
a2=b2+c2−2bccosAa^2 = b^2 + c^2 - 2bc \cos Aa2=b2+c2−2bccosA
oppositehypotenuse\frac{\text{opposite}}{\text{hypotenuse}}hypotenuseopposite
adjacenthypotenuse\frac{\text{adjacent}}{\text{hypotenuse}}hypotenuseadjacent
oppositeadjacent\frac{\text{opposite}}{\text{adjacent}}adjacentopposite
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