Start with the definition and rules governing the determination of lines "adjacent" to and opposite to acute angles in a right triangle. Adjacent cannot be the hypotenuse and the opposite leg to an angle cannot be one which forms the vertex. 3 different right triangles are drawn with 4 problems to solve with each. Basic trig. ratios were next presented, along with the statement that the ratio of the lengths of 2 legs of a right triangle depends on the angles of the triangle. The sine, cosine and tangent of an acute angle in a right triangle were defined in terms of length of legs opposite or adjacent/ length of hypotenuse or adjacent leg. The nemonic SOHCAHTOA was presented. A triangle with 2 acute angles was given, along with the length of the sides and hypotenuse, the sine,cosine, and tangent needed to be calculated.