< the point where the two rays meet is called a vertex.
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As long as the sides correspond then yes. The other three are: Side-Side-Side Side-Angle-Side - the angle *MUST* be between the two sides Right angle-Hypotenuse-Side
A right angle triangle has an hypotenuse which is its longest side, an adjacent side and an opposite side.
an equilateral triangle has 3 congruent sides and angle measures.
The Sine ratio is Sine(angle) = opposite side / hypotenuse side. This is written in 'short-hand' as Sin(angle) = o / h Similarly the cosine ratio is Cosine(angle) = adjacent side / hypotenuse side. Cos(angle) = a/h Similarly the tangent ratio is Tangent(angle) = opposite side /adjacent side. Tan(angle) = o/a NB THe sides refer to the sides of a right-angled triangle. NNB The angle referred to is NOT the right angle, but a selected angle from the other two angles.
There can be no tangent side. The tangent of an angle, in a right angled triangle, is a ratio of the lengths of two sides.