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Let's repeat the main concepts from our previous lessons.
The sine of an acute angle of a right triangle is the ratio between the opposite side of the angle to the hypotenuse.
The cosine of an acute angle of a right triangle is the ratio between the adjacent side of the angle to the hypotenuse.
Pythagorean theorem: in a right triangle the square of the hypotenuse is equal to the sum of the squares of the other two sides.
In a triangle, three interior angles always add to 180°.
Now let's choose the right concept for every diagram below.
Before we begin the main part of the lesson, I'll list the definitions, with which we are going to meet today:
Tangent of an acute angle.
Cotangent of an acute angle.
Table of values of trigonometric functions for 3 special angles.
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