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Right-Angled Triangle The triangle of most interest is the right-angled triangle. The right angle is shown by the little box in the corner: triangle showing Opposite, Adjacent and Hypotenuse Another angle is often labeled θ, and the three sides are then called: Adjacent: adjacent (next to) the angle θ Opposite: opposite the angle θ and the longest side is the Hypotenuse Why a Right-Angled Triangle? Why is this triangle so important?
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