Summer Quiz 2

∆DEF and ∆TUV are congruent triangles. Which statement is known to be true?

• DE≅TU

• DF≅TU

• DF≅UV

• DE≅TV

Which object is formed when right triangle RST shown below is rotated around leg RD?

• A pyramid with a square base

• an isosoceles Triangle

• a right triangle

• A cone

• Choice (1)

• Choice (2)

• Choice (3)

• Choice (4)

• Choice (1)

• Choice (2)

• Choice (3)

• Choice (4)

In the accompanying diagram, ΔABC is a right triangle and CD is the altitude to the hypotenuse AB. If AD = 4 and DB = 16, find the length of CD.

• 4√5

• 8

• 4√15

• 2√5