Trig Ratios of Special Angles Part 2

This lesson shows how to find the trig ratios of the special angles and how to use them to find exact values of expressions involving sine, cosine and tangent values of 0, 30, 45, 60 and 90 degrees. This is conclusion of a two part lesson. This lesson was created for the MCR3U course in the province of Ontario, Canada.

Category:

Education

Tags:

• MCR3U
• Functions

[MrButtonMonkey]

Thanks I'm reviewing for my exam and this helped a lot

[AlRichards314]

When the hypotenuse becomes the same as the opposite side, then it is like there are two 90 degree angles and a zero degree angle at the top. 90 + 90 + 0 = 180 degrees.

If it helps to visualize, think about a triangle (just before this happens) that has a right angle, an 89 degree angle and a 1 degree angle at the top. As the hypotenuse collapses onto the opposite side, the 89 degree angle grows to 90 degrees and the small 1 degree angle at the top reduces to 0 degrees.

[VerZatiLe]

Thanks alot!

[NandoG7]

crap i accidentally pressed a star rating =2 when i know it definitely = a 5. Thank you!