Thursday, December 29, 2011

The right angled triangle ABC has AB=6, BC=8 and AC is the hypotenuse. Find sinA, cosA and tanA.

Given the the right angle triangle ABC such that AC is the
hypotenuse.


Then, the right angle is
B.


==> Given the legs
are:


AB = 6


BC =
8


Then, we will calculate the hypotenuse AC using the
formula.


==> AC^2 = BC^2 +
AB^2


==> AC^2 = 6^2 + 8^2 = 36+64 =
100


==> AC = 10


Now we
need to find the following:


sinA = opposite/
hypotenuse.


We know that the side that is opposite to the
angle A is BC


==> sinA = BC/AC = 8/10 =
4/5


==> cosA = adjacent/
hypotenuse


                 = AB/AC = 6/10 =
3/5


==> tanA = sinA/cosA =
4/3


==> sinA = 0.8


==>cosA =
0.6


==> tanA =
4/3

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