Problem:
In the adjoining figure of a rectangular solid, and . Find the cosine of .
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Answer Choices:
A.
B.
C.
D.
E.
Solution:
Without loss of generality, let in the adjoining figure. Then ,
Since and . Since is isoceles,
.jpg)
Problem:
In the adjoining figure of a rectangular solid, and . Find the cosine of .
Answer Choices:
A.
B.
C.
D.
E.
Solution:
Without loss of generality, let in the adjoining figure. Then ,
Since and . Since is isoceles,