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Sec 1-3 Concept: Use Midpoint and Distance Formulas

Sec 1-3 Concept: Use Midpoint and Distance Formulas Objective: Given coordinates in a plane, find lengths of segments as measured by a s.g. Y. B. A. C. X. Example 1 : Find the length of AB. One way would be to use the Pythagorean Thm. a 2 +b 2 =c 2. C. 3. 3 2 +4 2 =C 2

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Sec 1-3 Concept: Use Midpoint and Distance Formulas

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  1. Sec 1-3 Concept: Use Midpoint and Distance Formulas Objective: Given coordinates in a plane, find lengths of segments as measured by a s.g.

  2. Y B A C X Example 1: Find the length of AB One way would be to use the Pythagorean Thm. a2+b2=c2 C 3 32+42=C2 9+16 = C2 25=C2 √25 = √C2 5 = C 4

  3. B A Distance Formula: (x2,y2) C C2=a2+b2 y2-y1 (x2,y1) (x1,y1) x2-x1

  4. Distance Formula If A(x1,y1) and B(x2,y2) are points in a coordinate plane, then the distance between A and B is

  5. Y B A X Example 2: Use the distance formula to find the length of AB (6,4) (2,1) AB = 5

  6. Example 3: Find the length of the segment with end points A(3,-2) and B(-4,1)

  7. Midpoint of a Segment: a point that divides the segment into 2 congruent segments (the middle)

  8. Example 4: • Find the midpoint of DE with endpoints D(3,5) and E(-4,0) • B. Find the midpoint of DE with endpoints D(-1,8) and E(2,-5)

  9. Example 5: • The midpoint of XY is M(2,1). One endpoint is Y(-7,11). Find the coordinates of the other endpoint • B. The midpoint of XY is M(-7,8). One endpoint is Y(4,-6). Find the coordinates of the other endpoint

  10. TODAY’S WORK

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