![lesson 20.notebook October 01, 2012
Lesson 20 WarmUp:
1) What is 15% of $80?
2) Using prime factorization, reduce: 625
1000
3
3) Simplify: 216
4) The number 9 is a member of which set(s) of numbers?
[List all of them!]
5) What is a linear pair of angles?
2](https://image.slidesharecdn.com/8thprealg-l20-oct1-121001110341-phpapp02/85/8th-pre-alg-L20-oct1-2-320.jpg)
8th pre alg -L20--oct1
- 1. lesson 20.notebook October 01, 2012 Assignment: 1>Set 20 (all) Due Wednesday (10/3) 1
- 2. lesson 20.notebook October 01, 2012 Lesson 20 WarmUp: 1) What is 15% of $80? 2) Using prime factorization, reduce: 625 1000 3 3) Simplify: 216 4) The number 9 is a member of which set(s) of numbers? [List all of them!] 5) What is a linear pair of angles? 2
- 3. lesson 20.notebook October 01, 2012 Lesson 20: *Naming Triangles... By angles: • 3 acute angles>acute triangle • 1 right angle>right triangle • 1 obtuse angle>obtuse triangle By sides: • 3 equal sides>equilateral triangle • at least 2 equal sides>isosceles triangle • no equal sides>scalene triangle 3
- 4. lesson 20.notebook October 01, 2012 Formula for area of a triangle: *base height or 1/2(base height) 2 (Base and height must be perpendicular!!) *The SUM of the measures of the angles in a triangle = 180 degrees 4
- 5. lesson 20.notebook October 01, 2012 Examples Lesson 20 pg. 129 A) isosceles triangle & right triangle B) equilateral triangle & acute triangle C) obtuse triangle & scalene triangle D) x = y = 5
- 6. lesson 20.notebook October 01, 2012 E) F) G) H) 6