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Mathematics
General Math
Trigonometry: Right-angled triangle
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[QUOTE="skeeter, post: 6776452, member: 1088"] part (i) of the student's response is correct. part (ii) has an algebra error in determining the length of DC if $DC^2 = DB^2 - CB^2$, then $DC \ne DB - CB$ the trig for part (iii) is correct ... can't say I agree with using 120 degrees for angle ADB since it induces rounding error in determining the length of AB. Using the equation $\sin(40) = \dfrac{BC}{AB} \implies AB = \dfrac{BC}{\sin(40)}$ will not induce that error. [/QUOTE]
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Forums
Mathematics
General Math
Trigonometry: Right-angled triangle
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