1. In ΔPQR measure of angle Q is 90°. If cosP = 5/13, and PQ = 2.5cm, then what is the length (in cm) of side PR?
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By: anil on 05 May 2019 02.04 am
Given : $$cos P$$ = $$frac{5}{13}$$ Also, $$cos P=frac{PQ}{PR}=frac{5}{13}$$ Let PQ = $$5x$$ cm and PR = $$13x$$ cm According to ques, => $$5x=2.5$$ => $$x=frac{2.5}{5}=frac{1}{2}$$ $$ herefore$$ PR = $$13 imesfrac{1}{2}=6.5$$ cm => Ans - (B)
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