It starts at point A, moves straight up 15 inches, to the right 7 inches and then straight down 6 inches to stop at point B. If M represents the midpoint of AB, then find AM.
Moving up changes the y- coordinate by 15, moving right changes the x- coordinate by 7, so the coordinate is (7, 15). If it then moves down 6 inches decreases the y- coordinate by 6 to (7, 9). Now that we have two coordinates, we can find the midpoint.
A spider is climbing on a wall.?
2016-09-09 9:45 pm
回答 (3)
2016-09-09 9:58 pm
15-6=9=y >>x=7 (0,0) to 7,9 mid point = ( 3.5 , 4.5 )
2016-09-09 9:57 pm
Draw a diagram!
Draw a line from B, perpendicular
to the 15" side. You now have a
right triangle with legs of 7 and 9 (15 - 6).
AB, the hypotenuse, is √(7^2 + 9^2) = √130
Since M is the midpoint of AB, AM + √130 / 2
Draw a line from B, perpendicular
to the 15" side. You now have a
right triangle with legs of 7 and 9 (15 - 6).
AB, the hypotenuse, is √(7^2 + 9^2) = √130
Since M is the midpoint of AB, AM + √130 / 2
2016-09-09 9:54 pm
So AM is the length, if we know the length of AB then it's just half
Since the change in x = 7 and the change in y = 9
d = sqrt(7^2 + 9^2) = sqrt(49 + 81) = sqrt(130)
So AM = sqrt(130)/2
Since the change in x = 7 and the change in y = 9
d = sqrt(7^2 + 9^2) = sqrt(49 + 81) = sqrt(130)
So AM = sqrt(130)/2
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