Dom's blog

This week, we did chapter 9-1. It talked about law of sins and solving for right triangles

SOCAHTOA is one easy way to remember all of these formulas.

sin(theta)=opposite/hypotenuse
cos(theta)=adjacent/hypotenuse
tan(theta)=opposite/adjacent
csc(theta)=hypotenuse/opposite
sec(theta)=hypotenuse/adjacent
cot(theta)=adjacent/opposite


These functions are only to be used when dealing with right triangles. The hypotenuse is opposite of the right angle.

For example: one leg of the right triangle ABC is 4 while the hypotenuse is 5 & angle B is 20 degrees. Find the second leg. First you draw the right triangle. Then you do sin20=opposite/hypotenuse. Which is sin20=x/5. mulitply 5 on both sides to get x=5sin20. which gives you 1.7