1. Pretest Please complete the pretest for this standard
on your own. Try to remember all you can from
our first discussion of this topic.
Day 1
The pretest can be found online at The teacher and student logins are the same as FCAT Explorer. If you have access to computers, you may wish to have your students complete this assessment online. Using the paper/pencil copy and a bubble answer sheet from Performance Matters will give you automatically graded assessment and valuable data for immediate use.

2. Find the lengths and midpoints of line segments in two-dimensional coordinate systems.
MA.912.G.1.1

3. LEQ: How do I use the distance and midpoint formulas?
Vocabulary: Draw a picture and list the formula for each term.
Term
Picture
Formula
Midpoint
Given where A (x1 , y1) and B (x2 , y2)
the coordinates of the midpoint of are M
Distance
The distance between two points
A (x1 , y1) and B (x2 , y2) is
Vocab should be interactive when possible.

4. I do… Find the midpoint of the segment .
Step 1: List the coordinates of the endpoints.
P (-4, 6)
Q (8, -6)
Step 2: Re-write the formula M
Step 3: Substitute the values of P and Q into the midpoint formula. M
Day 2
Step 4: Simplify M

5. The coordinates of R is (4, 4)
I do…
Given the midpoint of the segment and an endpoint, find the other endpoint.
The midpoint of RS is M (6, 3) and the coordinates of the endpoint S is (8, 2) What are the coordinates of R?
Step 1: To find the x coordinate re-write that part of the formula and solve for x1.
Step 2: To find the y coordinate re-write that part of the formula and solve for y1.
Day 2
The coordinates of R is (4, 4)

6. I do… Finding the distance between two points.
Find the distance between the two points to the nearest tenth.
P(8, 2) and Q(3, 8)
Step 1: Write the distance formula.
Step 2: Substitute the correct values.
X1 = 8, y1 = 2,
X2 = 3, y2 = 8,
Step 3: Simplify.

7. We do
Sage and Scribe
Day 3 and 4
Low to Moderate DOK
Sage and Scribe

8. We do… Shoulder Partner 1. List the coordinates of two points.
Have your partner find the midpoint and distance of the two coordinates.
Pass back the paper to its owner and coach or praise your partner’s work.
2. List a midpoint and an endpoint of a line segment.
Have your partner find the other endpoint and the distance of the segment.
Day 3 and 4
Moderate/High DOK

9. You Do 1.
2. Find the distance between the two points to the nearest tenth.
C (3, 2) and D (5, 8)
3. M is the midpoint of AB . The coordinates of endpoint B are given. What are the coordinates of A?
M: (4, 5); B: (5, 9); S: ?
All three questions.

10. You Do 1.
All three questions.
Answer: (1,3)

11. You Do
2. Find the distance between the two points to the nearest tenth.
C (3, 2) and D (5, 8)
All three questions.
Answer: 6.3

12. You Do
3. M is the midpoint of AB . The coordinates of endpoint B are given. What are the coordinates of R?
M: (4, 5); B: (5, 9); A: ?
All three questions.
Answer: A (3,1)

13. Post Test
Please complete the post test for this standard on your own. Do the best you can, hopefully you will show improvement over your pretest score.
Day 6
The post test can be found online at The teacher and student logins are the same as FCAT Explorer. If you have access to computers, you may wish to have your students complete this assessment online. Using the paper/pencil copy and a bubble answer sheet from Performance Matters will give you automatically graded assessment and valuable data for immediate use.