Find the velues of interior angle A of a triangle whose vertices are A(3,-2), B(-5,8) and C(4,5). Please help me and show the solution... Thanks!
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Originally Posted by lance Find the velues of interior angle A of a triangle whose vertices are A(3,-2), B(-5,8) and C(4,5). Please help me and show the solution... Thanks! Use Pythagoras to find the length of all the sides, then use the Cosine Rule to find angle A.
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