Question 45
Δ DEF is right angled at E. If m ∠D = 30°. What is the length (in cm) of DE, if EF = 2√3 cm?
Solution
Given : EF = 2√3 cm and $$\angle$$ D = $$30^\circ$$
To find : DE = ?
Solution : In $$\triangle$$ DEF,
=> $$cot(30^\circ)=\frac{DE}{EF}$$
=> $$\sqrt3=\frac{DE}{2\sqrt3}$$
=> $$DE=\sqrt3\times2\sqrt3=6$$ cm
=> Ans - (C)
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