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In ΔDEF Measure of angle E is 90°. If cosD = $$\frac{5}{{13}}$$ and DE = 1 cm. Then what is Length of side EF?
Answer & Solution
Correct Answer:
Option
B

$$\eqalign{ & 5\,{\text{unit}} \to 1\,{\text{cm}} \cr & 1\,{\text{unit}} \to \frac{1}{5}\,{\text{cm}} \cr & {\text{EF}} = 2.4\,{\text{cm}} \cr} $$
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