Question

Do 1. Lucas makes the statement: "The exterior angles of a triangle are always

obtuse." of the following, which provides a counterexample to the statement?
о
Right Triangle
&
Acute Triangle
Equilateral Triangle
о o
Isosceles Triangle
CLEAR ALL

Answer 1

Answer: A) Right Triangle

The exterior angle to the 90 degree interior angle is 90 degrees because 90+90 = 180. So this exterior angle is not obtuse.