http://www.ck12.org Chapter 8. Right Triangle Trigonometry
The figure to the right is a rectangular prism. All sides (or faces) are either squares (the front and back) or rectangles
(the four around the middle). All sides are perpendicular.
- Findc.
- Findd.
21.WritingExplain whym^6 A= 90 ◦.- Fill in the blanks for the proof of Theorem 8-4.
Given: In 4 ABC,a^2 +b^2 <c^2 , wherecis the longest side. In 4 LMN,^6 Nis a right angle.Prove: 4 ABCis
an obtuse triangle. (one angle is greater than 90◦)TABLE8.2:
Statement Reason- In 4 ABC,a^2 +b^2 <c^2 , andcis the longest side. In
4 LMN,^6 Nis a right angle.
2.a^2 +b^2 =h^2
3.c^2 >h^2
5.^6 Cis the largest angle in 4 ABC.
6.m^6 N= 90 ◦
7.m^6 C>m^6 N
- Transitive PoE
9.^6 Cis an obtuse angle. - 4 ABCis an obtuse triangle. 433