Geometry  Grade 5
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What is an obtuse angle?
An angle that measures greater than 90°.

What is an acute angle?
An angle that measures less than 90°.

What is a right angle?
An angle made by a square corner. A right angle measures 90°.

What are the names we can use to sort triangles by angle measure?
 1) acute triangle
 2) right triangle
 3) obtuse triangle

What is a right triangle?
A triangle with one right angle.

What is an obtuse triangle?
A triangle with one obtuse angle.

What is an acute triangle?
A triangle with only acute angles.

What names can we use to sort triangles by side lengths.
 1) equilateral triangle
 2) isosceles triangle
 3) scalene triangle

What is an equilateral triangle.
A triangle having all sides equal in length.

What is an isosceles triangle.
A triangle having two sides equal in length.

What is a scalene triangle?
A triangle having no two sides equal in length.

Which of the following triangles is an equilateral triangle?

Which of the following triangles is an isosceles triangle?

Which of the following is a scalene triangle?

What is a polygon?
 A closed 2D shape with sides made from straight line segments.

What is a regular polygon?
A polygon that has all sides equal and all angles equal.

What is an irregular polygon?
 A polygon that does not have all sides equal and all angles equal.

What is the name for all 3sided polygons?
Triangles

What am I?
I am a closed 2D shape made from straight line segments.
A polygon.

I am a polygon.
I am a quadrilateral.
I only have one pair of parallel sides.
I have two acute angles.
I have two obtuse angles.
 A trapezoid

I have four sides and four right angles.
My opposite sides are the same.
I have four corners.
I am a 2D shape.
 Rectangle.

What Am I?
I have four sides.
All my sides are equal in length
I have two acute angles.
I have two obtuse angles.
 A rhombus.

What do "quad" and "lateral" mean in quadrilateral?
 Quad is latin for: four
 Lateral is latin for: sides

What do "equi" and "lateral" stand for in the word equilateral?
 Equi means equal.
 Lateral means sides.