SaiBook.us SAT-2

Lesson Example Discussion Quiz: Class Homework

Example

Title: Trigonometry ratios in right triangles

Grade: 1400-a Lesson: S3-L2

Explanation: The best way to understand SAT-2 is by looking at some examples. Take turns and read each example for easy understanding.

Examples:

find sin(a) in △ABC given below:

$1$

Step 1a

The formula of sine: sine is defined as the ratio of the opposite to the hypotenuse. \$(sina = "opposite"/"hypotenuse")\$.
Find the values of the opposite side and hypotenuse side.
\$sina = "BC"/"AB"\$
Substitute the values:
BC = 4
AB = 3
sina = \$4/3\$
So, the value \$sina = 4/3\$.

Explanation: Use the sine formula and substitute the given value to obtain the value of \$sina = 4/3\$.