Question 935890: A triangle has its vertices at A(7,4), B(1,7) and C(-3,4). What is the interior angle (to the nearest degree) at vertex A?
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! A triangle has its vertices at A(7,4), B(1,7) and C(-3,4). What is the interior angle (to the nearest degree) at vertex A?
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AC is "horizontal" - parallel to the x-axis
--> the altitude from B intersects AC at D(1,4)
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The length of AD is 6.
The length of BD is 3.
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tan(A) = 3/6
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