Classify Triangles, Quadrilaterals, Polygons

Which of the following MUST be true for a triangle to be scalene?

• all 3 sides cannot be congruent

• two sides have to be congruent

• all angle measures are less than 90 degrees

• must have 4 congruent sides and angles

I am a triangle with all sides measuring less than 90 degrees. What am I?

• Right triangle

• Scalene triangle

• Acute triangle

• Obtuse triangle

Classify this triangle based on its angles.

• acute

• right

• obtuse

Classify this triangle based on its angles.

• acute

• right

• obtuse

I am a polygon with congruent sides. Select ALL the answers that are TRUE.

• equilateral triangle

• rhombus

• square

• trapezoid

The figure can be classified as –

• a parallelogram but not a rectangle

• a rhombus but not a square

• a rectangle but not a rhombus

• a quadrilateral but not a parallelogram

How is the figure above best classified?

• Scalene triangle

• Isosceles triangle

• Obtuse triangle

• Right triangle

Which of the following titles best completes the graphic organizer?

• Trapezoid

• Parallelogram

• Triangle

• Diamond

Which figures belong in the part of the organizer labeled “Isosceles triangles”?

• Figures II and V only

• Figures I, III, and V only

• Figures I and III only

• Figures II, IV, and V only

Which characteristic does NOT accurately describe polygons?

• Straight sides

• Closed figure

• At least 3 sides

• Curved sides