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Diagnostic Test 1

Question 1 of 155

$\bigtriangleup ABC \sim \bigtriangleup DEF$ ; $\angle F$ is a right angle; $\overline{AB}=20$ ; $\overline{AC}=10$ ; $\overline{DE}=30$

Find $\overline{EF}$ .

What is the surface area of the following tetrahedron? Assume the figure is a regular tetrahedron.

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