On the product of the slopes of two perpendicular lines
作者:
JaimeCarvalho E Silva,
期刊:
International Journal of Mathematical Education in Science and Technology
(Taylor Available online 1986)
卷期:
Volume 17,
issue 4
页码: 517-519
ISSN:0020-739X
年代: 1986
DOI:10.1080/0020739860170412
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
We show that when one line approaches a vertical line and another line approaches a horizontal line, the product of the slopes can approach any real number or +oo or — oo or nothing, thus clarifying preceding statements of Subramaniam and Das. We stress that the slope of a vertical line does not exist and explain why all these discussions are very useful in the classroom.
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