In the figure, m∠B = m∠C and ∠D is a right angle. cos B =

QUESTION POSTED AT 01/06/2020 - 03:42 PM

Answered by admin AT 01/06/2020 - 03:42 PM

Because m∠B = m∠C, therefore
cosB =  cosC

By definition,
cosC= \frac{CD}{AC}

Therefore
cosB= \frac{CD}{AC}

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