1. ∆DEF is right angled at E. If m∠D = 45°, then find the value of (tanF + 1/3).
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By: anil on 05 May 2019 02.02 am
Sum of angles of $$ riangle$$ DEF = $$angle D+angle E+angle F=180^circ$$ => $$45^circ+90^circ+angle F=180^circ$$ => $$angle F=180^circ-135^circ=45^circ$$ To find : $$( an F + frac{1}{3})$$ = $$tan(45^circ)+frac{1}{3}$$ = $$1+frac{1}{3}=frac{4}{3}$$ => Ans - (A)
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