page, Noir
Find the fourth vertes of the parallelogram whose
consecutive vertices are (2,5), (7,4) 15:).
А A
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Step-by-step explanation:
A(8,4)B(5,7)C(−1,1).
Let D(x,y)
m.p of BD = m.p of AC
(
2
5+x
,
2
7+y
)=(
2
8−1
,
2
4+1
)
(
2
5+x
,
2
7+y
)=(
2
7
,
2
5
)
2
5+x
=
2
7
2
7+y
=
2
5
5+x=7 7+y=5
x=2 y=−2
∴D(2,−2)
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