Isosceles Triangles Answers

3 connecting lines are shown. Line A B is horizontal. Line A C is about half the length of A B. Line B C is about one-third of the length of A B.

Which statements about the diagram are true? Select three options.

3 connecting lines are shown. Line D F is horizontal. Line D E is about half the length of line D F. Line F E is about one-third of the length of line D F.

Triangle QRS has the angle measures shown.

If triangle DEF has a 90° angle at vertex E, which statements are true? Select two options.Triangle DEF is an obtuse triangle.The angle at vertex D is acute.The angle at vertex F is obtuse.Triangle DEF is a right triangle.The angle at vertex D is obtuse.

Triangle QRS is a right triangle with the right angle at vertex R. The sum of m∠Q and m∠S must be

Fiona's school is in the shape of a triangle, with three hallways connecting the corners. Fiona enters the building and walks 90 yards through the first hallway to the first corner. Then, she walks 60 yards through the second hallway to the second corner.

Triangle ABC is an obtuse triangle with the obtuse angle at vertex B. Angle A must be

In triangle XYZ, m∠Z > m∠X + m∠Y. Which must be true about △XYZ?

Which are the possible side lengths of a triangle?