Answer:
Step-by-step explanation:
Given
Required
Expand
Open bracket
So, the result of the expression is:
For which values of k, do the pair of linear equations
1 answer:
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Answer:
Obtuse triangle
Step-by-step explanation:
Given are the vertices of a triangle
Let A (-4, 0, 0),B (0, 0, 0),C(7, 2, 6)
Let us find angles between AB, BC and CA
AB = (4, 0,0): BC = (7,2,6) : CA = (11, 2,6)
Cos B =
B = arc cos =137 deg 54 min 7 sec
Similarly
A=29 deg 53 min 53 seconds
C = 12 deg 12 min 3 sec
Obtuse triangle since one angle > 90 degrees