If triangle DEF has a 90° angle at vertex E, which statements are true? Check all that apply.
a. Triangle DEF is an obtuse triangle.
b. The angle at vertex D is acute.
c. The angle at vertex F is obtuse.
d. Triangle DEF is a right triangle.
e. The angle at vertex D is obtuse.
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Home » Mathematics » If triangle DEF has a 90° angle at vertex E, which statements are true? Check all that apply. a. Triangle DEF is an obtuse triangle. b. The angle at vertex D is acute. c. The angle at vertex F is obtuse. d. Triangle DEF is a right triangle. e.