Prentice Hall Lesson 11.3 EQ: What is the distance formula? Midpoint formula?

1
Prentice Hall Lesson 11.3EQ What is the
distance formula? Midpoint formula?

• BOP A radioactive isotope decays exponentially.
  If the isotope has a half-life of 9 years and
  0.696 mg remains after 36 years, what was the
  size of the initial sample?

2
ALGEBRA 1 LESSON 11-2
pages 587590  Exercises 2. 25 4. 26 6. 1 8. 5
10. 7.1
24. no 26. 1.5 28. 3 30. 2.6 32. a. 6 5
ft b. 80.5 ft2 34. no
12. 0.6 14. about 15.5 ft 16. yes 18. no 20. no
22. yes
11-2
3
ALGEBRA 1 LESSON 11-2
36. yes 38. 1000 lb 40. 9.0 42. a. These
lengths could be 2 legs or one leg and the
hypotenuse. b. about 12.8 in. or 6 in.
44. a. 6.9 ft b. 89.2 ft2 c. 981
watts 46. a. Answers may vary. Sample 5,
20, 5 b. 5 units2 48. An integer has 2 as a
factor the integer is even if an integer is
even, then it has 2 as a factor true.
11-2
4
ALGEBRA 1 LESSON 11-2
50. You are in Brazil you are south of the
equator if you are south of the equator you
are in Brazil false. 52. 52 units2
54. 10 56. 5
11-2
5
Prentice Hall Lesson 11.3EQ What is the
distance formula? Midpoint formula?

• Toolbox
• The Distance Formula The distance d between
  any two points (x1, y1) and (x2, y2) is
• d v(x2 x1)² (y2 y1)²
• The Midpoint Formula The midpoint of a line
  segment with endpoints A(x1, y1) and B(x2, y2)
  is ( , )

x1 x2 y1 y2 2 2
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ALGEBRA 1 LESSON 11-3
Find the distance between F(6, 9) and G(9, 4).
The distance between F and G is about 5.8 units.
11-3
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ALGEBRA 1 LESSON 11-3
Find the exact lengths of each side of
quadrilateral EFGH. Then find the perimeter to
the nearest tenth.
GH 2 3 5
11-3
8
ALGEBRA 1 LESSON 11-3
11-3
9
ALGEBRA 1 LESSON 11-3
A circle is drawn on a coordinate plane. The
endpoints of the diameter are (3, 5) and (4,
3). What are the coordinates of the center of
the circle?
11-3
10
ALGEBRA 1 LESSON 11-3
7.2
7.1
(9, 3)
9.5 units
11-3
11
8th grade EOG Review

• Clear desk except for work paper, pencil, BLUE
  calculator.
• DO NOT WRITE ON THE TEST PAPER!!!
• Record your answers on the scantron card.
• Complete as many problems as you can.
• We will complete the test this week and go over
  the solutions after your Chapter 11 Test next
  week before the EOGs.