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joyelewis58
10.12.2020 •
Mathematics
What is the value of k?
k=
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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.