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allisonchorath6971
20.12.2020 •
Mathematics
Given: D is the midpoint of AB: E is the midpoint of AC
Prove: DE 1 BC
Complete the missing parts of the paragraph proof
Proof
To prove that DE and BC are parallel, we need to show
that they have the same slope.
slope of DE
V
A(25, 20)
loro, o
CC
GDD
Elab, o)
slope of BC
BIOO)
C(2,0)
Therefore, because
DE I BC.
Solved
Show answers
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Ответ:
Step-by-step explanation:
Slope of DE =![\frac{y_2-y_1}{x_2-x_1}](/tpl/images/1003/0484/f6758.png)
=![\frac{c-c}{a+b-b}](/tpl/images/1003/0484/f14ff.png)
= 0
Slope of BC =![\frac{y_2-y_1}{x_2-x_1}](/tpl/images/1003/0484/f6758.png)
=![\frac{0-0}{2a-0}](/tpl/images/1003/0484/675ea.png)
= 0
Therefore, DE║BC because slopes of BC and DE are equal.
Ответ:
Multiplying through by 100, we have
-100k + 3 + 101k = -245 - 181k