1. 1.3 Midpoint & Distance Formulas August 15, 2012
Bellwork
3.2
3.2 - 2 = 1.2
1. Find the missing length 2 C
A B
2. Are DE & GH congruent, NO, DE = 24 & GH = 5
if D(-4,11), E(-4,-13), G(-14,5), H(-9,5)?
3. How do you name a plane? Must be 3 non-collinear points in
4. What is a postulate? that plane
a rule that is accepted without proof
2
1 3 24
5. 2 +3 5 5 =61
2 4
3 = 4 4
+34
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2. 1.3 Midpoint & Distance Formulas August 15, 2012
1.3 Midpoint and Distance
Midpoint (M): point that divides the
segment into 2 congruent ( ≅) segments
C
A D M B
Segment Bisector (CD):a point, ray, line, line
segment, or plane that intersects the segment
at its midpoint.
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3. 1.3 Midpoint & Distance Formulas August 15, 2012
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4. 1.3 Midpoint & Distance Formulas August 15, 2012
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5. 1.3 Midpoint & Distance Formulas August 15, 2012
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6. 1.3 Midpoint & Distance Formulas August 15, 2012
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7. 1.3 Midpoint & Distance Formulas August 15, 2012
Midpoint Formula
( 2
,
x1 + x2 y1 + y2
2 )
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8. 1.3 Midpoint & Distance Formulas August 15, 2012
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9. 1.3 Midpoint & Distance Formulas August 15, 2012
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10. 1.3 Midpoint & Distance Formulas August 15, 2012
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11. 1.3 Midpoint & Distance Formulas August 15, 2012
Distance Formula
AB = √(x2 - x1)2 + (y2 - y1)2
or
(AB)2 = (x2 - x1)2 + (y2 - y1)2
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12. 1.3 Midpoint & Distance Formulas August 15, 2012
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13. 1.3 Midpoint & Distance Formulas August 15, 2012
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14. 1.3 Midpoint & Distance Formulas August 15, 2012
HW:
pg 19
#4-36 evens
except 24. yippee!!
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