1. ∆ PQR is right angled at Q. If m∠R = 60°, what is the length of PR (in cm), if RQ = 4√3 cm?





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  • By: anil on 05 May 2019 01.44 am
    cos60°= $$frac{QR}{PR}$$
    $$Rightarrow frac{1}{2}=frac{4sqrt{3}}{PR}$$ $$Rightarrow PR = 8sqrt{3}$$
    so the answer is option D.
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