http://www.ck12.org Chapter 8. Right Triangle Trigonometry
We know half of a square is a 45-45-90 triangle, so 10=s
√
2.
s√
2 = 10
s=10
√
2
·
√
2
√
2
=
10
√
2
2
= 5
√
2
Watch this video for help with the Examples above.
MEDIA
Click image to the left for use the URL below.
URL: http://www.ck12.org/flx/render/embeddedobject/52510CK-12 Foundation: Chapter8454590RightTrianglesB
Vocabulary
Aright triangleis a triangle with a 90◦angle. A45-45-90 triangleis a right triangle with angle measures of 45◦, 45 ◦,
and 90◦.
Guided Practice
- Find the length of the missing sides.
- Find the length ofx.