Teacher Notes

1
Teacher Notes

• Im going to have 3 volunteers put up their
  answers to the warm up in the box provided.
• Pythagorean Thm comes up again with triangle
  similarity according to the standards, so I just
  put an intro to it to talk about where the
  distance formula comes from.
• Workbook does not include problems finding the
  missing coordinate for distance, may want to
  include some of your own
• HW Answers from Workbook on last slides

2
Warm Up

• Blue Workbook p.13 13-15

13. 14. 15.
3
BasicFormulasused in Geometry

• Unit 9 Notes

4
Ex.1 Find the length of the segment and the
coordinates of the midpoint of the segment.
b.
a.
5
Midpoint Formula
Remember to label your 2 points ( ,
) and ( , )
6
Ex.2 Find the midpoint of a line segment with
endpoints (-11, -3) and (2, -5)
7
Ex.3 Find the midpoint of the line segment.
8
Ex.4 The midpoint of a line segment is (25, 0).
One of the endpoints is (30, -5), find the other
endpoint.
9
Practice The midpoint of a line segment is (10,
6). One of the endpoints is (14, 3), find the
other endpoint.
10
Distance Formula
Remember to label your 2 points ( ,
) and ( , )
11
Ex.5 Find the distance between (4, -3) and (-7,
2).
12
Ex.6 Find the length of the line segment. Round
to the nearest tenth of a unit.
13
Ex.7 The distance between (3, 2) and (b, -9) is
11 units. Find the possible value(s) of b.
 
14
PracticeThe distance between (b, 4) and (2, -1)
is 5 units. Find the possible value(s) of b.
 
15
 
 
16
Practice
 
 
17
Pythagorean Thm and Distance Formula
18
Assignment

• Blue Workbook
• p.7 8-22, 26

19
Homework Answers
20
Homework Answers
21
Homework Answers
22
Homework Answers