- #1
soopo
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Homework Statement
You have a diameter in a circle, 2R. Show that the angle drawn from the end points of the
diameter to the circle is 90 by Linear Algebra.
The Attempt at a Solution
The situation seems to be E^3.
We get triangle A and B inside the circle such that we have ABCD which has two 90 angles: ABC and ADC.
Let one axis be along AB, one axis along AD and one axis along AC such that
A = (0,0,0), B = (1,0,0), C = (0,0,1) and D = (0,1,0).
We want to show that the dot product between AB and BC is zero
AND the product between AD and DC is zero.
#1:
CB = (-1,0,1)
OB = (-1,0,0)
CB * OB = 1
which is a contradiction to the wanted result.
This would mean that the angle is not 90 which is however false.