Triangle, – A shape with three sides and three angles., Right-Angled Triangle, – A triangle with one angle that is exactly 90 degrees., Hypotenuse, – The longest side of a right-angled triangle, opposite the right angle., Opposite Side, – The side across from the angle you're looking at in a triangle., Adjacent Side, – The side next to the angle you're looking at (but not the hypotenuse)., Angle, – The space between two lines that meet at a point., Sine (sin), – A ratio: opposite side ÷ hypotenuse., Cosine (cos), – A ratio: adjacent side ÷ hypotenuse., Tangent (tan), – A ratio: opposite side ÷ adjacent side., Ratio, – A comparison of two numbers or values., Measure, – To find the size, length, or amount of something., Protractor, – A tool used to measure angles..

Trigonometry

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