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Mathematics 11 Online
OpenStudy (anonymous):

-

OpenStudy (kc_kennylau):

Did you learn the cosine rule?

OpenStudy (kc_kennylau):

Yes or no?

OpenStudy (kc_kennylau):

Never mind if no, if a^2+b^2>c^2, theta is acute; if a^2+b^2<c^2, theta is obtuse

OpenStudy (kc_kennylau):

Don't doubt yourself!

OpenStudy (kc_kennylau):

cos theta > 0 because theta is acute

OpenStudy (anonymous):

okay?

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