Definition
of Trigonometric Functions of Acute Angles
In a right triangle, the side opposite the right angle is called the hypotenuse.
Let 
represent the
angle in the right triangle figure above.
From the above definitions, the following relations are immediate.
See Examples 1 – 2, pages 427 – 428, of the textbook.
Solving
Right Triangles
In a right triangle, given the measures of two sides, or the measures of one side
and an acute angle, we can
calculate the measures of the remaining sides and the remaining angles.
See Examples 3 - 6, pages 429 - 432, of the textbook.
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