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EleoNora [17]
3 years ago
8

Find the coordinates of point E if C is the midpoint of AE A has the coordinates of (-3,1) C has the coordinates of (-2,-1)

Mathematics
1 answer:
IrinaK [193]3 years ago
7 0
coordinates\ of\ E(x,y)\\\\ 
midpoint:\ C(-2,-1)\\
endpoint:\ A(-3,1) \\\\ 
B(-2,-1)=(\frac{-3+x}{2}\ ;\ \frac{1+y}{2})\\\\
-2=\frac{-3+x}{2}\ \ | multiply\ by\ 2\\
-4=-3+x\ \ | add\ 3\\
-1=x\\\\
-1=\frac{1+y}{2}\ \ | multiply\ by\ 2\\
-2=1+y\ \ \ | subtract\ 1\\
-3=y\\\\Coordinate\ of\  C=(-1,-3)
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I've included a picture so you can see.

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Next, to determine if it is obtuse or acute, usually your supposed to use a^2 + b^2 = c^2

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