Geometry Chapter 9 Vocabulary

The branch of mathematics dealing with the relations of the sides and angles of triangles and with the relevant functions of any angles.

• Trigonometry

• Geometry

• Hypotenuse

• Theta

In a right triangle, the ratio of the side opposite / the hypotenuse

• sine

• cosine

• tangent

• hypotenuse

In a right triangle, the ratio of the side adjacent / the hypotenuse

• sine

• cosine

• tangent

• trigonometry

In a right triangle, the ratio of the side opposite / the side adjacent

• sine

• cosine

• tangent

• hypotenuse

A mnemonic device to help remember the relationship of the three trig relationships (Sine, Cosine, or Tangent) and the sides they represent. Sine = opp / hyp ; Cos = Adj / hyp ; Tan = opp / adj

• SOHCAHTOA

• CAHTOASOH

• COHSAHTOA

• Trigonometry

Longest side in a right triangle; opposite the right angle.

• hypotenuse

• tangent

• long leg

• adjacent leg

In a right triangle, the sides that include the right angle; in an isosceles triangle, the pair of congruent sides.

• right triangle

• leg of a right triangle

• hypotenuse

• adjacent

A triangle that has a 90 degree angle.

• right triangle

• obtuse triangle

• acute triangle

• hypotenuse

90 degree angle

• right angle

• right triangle

• hypotenuse

• acute angle

In a right triangle the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the legs A²+B²=C²

• pythagorean theorem

• hideous theorem

• hypotenuse

• logarithms