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Published byEthan Griffin Modified over 6 years ago
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Do Now Tell whether these two lines are parallel, perpendicular or neither. Given the ordered pair, (-1, 4), write an equation in point-slope form that is perpendicular to the line 3x + 9y = 8.
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Homework Check Make sure you are fixing your mistakes
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Midpoint and Distance
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How do we find a midpoint?
What is a midpoint? A point in the middle! How do we find a midpoint? Taking the average of two coordinate points
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To find the midpoint: Average the x-values Average the y-values
This gives you a point in the middle (x, y)
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Find the point that is half way between the given points.
1) (2, 3) and (10, 3) 2) (-2, 6) and (-2, -2) 3) (1, -3) and (5, 7)
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ANSWERS 1) (2, 3) and (10, 3)
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ANSWERS 2) (-2, 6) and (-2, -2)
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ANSWERS 3) (1, -3) and (5, 7)
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What is a rule that we can use to find the midpoint
What is a rule that we can use to find the midpoint? (almost like a formula)
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Midpoint Find the midpoint between A(4,8) and B(1,12)
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YOU TRY!! Find the midpoint between: A) (2, 7) and (14, 9)
B) (-5, 8) and (2, - 4)
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How would you find the distance “as the crow flies”?
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Brainstorm: How could we find the distance of each segment?
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Let’s try
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Let’s try
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(subtract x)2 + (subtract y)2 = d2
The distance formula: (subtract x)2 + (subtract y)2 = d2 What happens when we solve for d?
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Distance Formula **Leave the answer in simplest radical form, unless the directions tell you otherwise.
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YOU TRY!! A. (2, 7) and (11, 9) B. (-5, 8) and (2, - 4)
Find the distance between: A. (2, 7) and (11, 9) B. (-5, 8) and (2, - 4)
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Connections to EOC Assessment:
B Connections to EOC Assessment:
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Find the endpoint C if M is the midpoint of the segment CD and M=(2, 4) and D=(5, 7).
(-1, 1)
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The midpoint of a segment AB is M=(6, -2). A has coordinates (1, 2)
The midpoint of a segment AB is M=(6, -2). A has coordinates (1, 2). Find the coordinates of B. (11, -6)
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Distance Formula 1) (5, 3) and (2, 7) 4) (3, -4) and (6, 2)
Find the distance between the following pairs of points: Put your answers in simplest radical form. 1) (5, 3) and (2, 7) 4) (3, -4) and (6, 2) 2) (-3, 0) and (5, -4) 5) (-3, 5) and (-3, -5) 3) (-2, 5) and (7, 5)
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ANSWERS 1) (5, 3) and (2, 7)
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ANSWERS 2) (-3, 0) and (5, -4)
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ANSWERS 3) (-2, 5) and (7, 5)
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ANSWERS 4) (3, -4) and (6, 2)
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ANSWERS 5) (-3, 5) and (-3, -5)
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