Classifying 2-D Shapes (Topic 12)

What are two terms that can be used to correctly classify the triangle by its angles and sides?

• right, scalene

• right, equilateral

• acute, scalene

• acute, equilateral

Which of the following names below can NOT be used to describe this shape?

• rectangle

• parallelogram

• quadrilateral

• square

Which of the following terms can be used to classify a triangle with angles that measure 55°, 60°, and 65°?

• acute

• obtuse

• right

Which of the following triangles can be classified as an isosceles triangle?

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The three angles inside a triangle add up to how many degrees?

• 180°

• 100°

• 190°

• 360°

True or False: Polygons are closed shapes made up of straight line segments.

• True

• False

Which of the following shapes is NOT a regular polygon?

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Which of the following quadrilaterals has only ONE set of parallel sides?

• trapezoid

• square

• rectangle

• parallelogram

Which two quadrilaterals below both have four equal sides?

• square and rhombus

• rectangle and square

• rhombus and trapezoid

• parallelogram and trapezoid

Fill in the blank: "A square can also be called a quadrilateral, a parallelogram, a rectangle, and a ____________. But only a square can be called a square!"

• rhombus

• triangle

• irregular polygon

• trapezoid