Polygons
Name 5 polygons
Triangle, Square, Rhombus, Trapezoid, Pentagon, Hexagon, Heptagon, Octagon
How many lines of symmetry does a square have?
3! (2 diagonal and 1 vertical)
I have one set of parallel lines,
I have four sides,
I have 1 line of symmetry.
What Am I?
A Trapezoid!
What is an equilateral triangle?
All its sides are equal.
A right angle looks like a corner of a square.
Two lines (one vertical & one horizontal) are perpendicular.
Does a polygon have to be 2D?
Yes!
Name the 3 lines of symmetry.
Vertical, Diagonal, Horizontal.
I have three sides
but none of my sides are equal!
What kind of triangle am I?
A scalene triangle.
How many sides are equal in an isosceles triangle?
An isosceles has two equal sides.
How many right angles are there in a square?
4!
Is a Circle a Polygon?
No!
Because it does NOT have straight sides.
How many lines of symmetry does the letter H have?
2! A horizontal and a vertical line!
I am a polygon,
I have 4 sides,
but I have no lines of symmetry.
What am I?
A parallelogram! (They have NO lines of symmetry)
How many lines of symmetry are there in an isosceles triangle?
1! An isosceles triangle has one vertical line of symmetry.
How many right angles are there in an equilateral triangle?
0. Each angle in an equilateral triangle is 60 degrees. A right angle is 90 degrees.
Pentagon, Square, Octagon, Rhombus, Hexagon, Trapezoid, Heptagon, Triangle
Triangle, Square, Rhombus, Trapezoid, Pentagon, Hexagon, Heptagon, Octagon
How many lines of symmetry does a circle have?
Infinite! No matter how you fold a circle in half, the parts of the circle will always be EQUAL.
I am a polygon,
I have 7 lines of symmetry,
What am I?
A heptagon.
How many sides are equal in a scalene triangle?
0 sides are equal! All the sides are different in length.
Is an acute angle bigger or smaller than a right angle?
An acute angle is smaller than a right angle. It is less than 90 degrees.
i) Is every quadrilateral a parallelogram?
ii) Name a shape as an example.
No. Not all quadrilaterals are parallelograms!
A trapezoid (4 sides) is a quadrilateral that is NOT a parallelogram.
i) Do ALL polygons have a line of symmetry?
ii) Name a polygon
No, not all polygons have to have a line of symmetry.
A parallelogram does not have any lines of symmetry.
I have 2 lines of symmetry,
I have 4 sides,
I have 4 right angles,
but I am NOT a square!
What am I?
How many lines of symmetry are there in a scalene triangle?
0! There are no lines of symmetry in a scalene triangle.
BONUS + 100 POINTS: An obtuse angle is ________ than a right angle BUT less than _________ degrees.
An obtuse angle is bigger than a right angle BUT less than 180 degrees.