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OpenStudy (anonymous):
In triangle ABC, angle A is a right angle, and angle B= 45 degrees. what is the length of BC?
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OpenStudy (anonymous):
OpenStudy (anonymous):
that ABC triangle is rectangule striangle (one angle has 90º) and ,besides, you know it is isosceles. So you know the angles, 90º,45º,45º. You also know that CA is 11 feet. Resolution: cos (45º)=11/BC<=> BC=11*2^1/2 => answer D. I presume you know how to solve equations, the co-sin(45º) is 1/2^1/2 and the total of a triangle's angles is 180º
OpenStudy (anonymous):
sorry wrong attachment!
OpenStudy (anonymous):
um sorry I don't know how to solve that equation! @smith92
OpenStudy (anonymous):
google a graphing calculator that shows sin cos tan etc
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OpenStudy (anonymous):
okay!
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