Polygons
What is the name for a 4 sided figure?
quadrilateral
What are the two ways to identify triangles?
By angle and by side length
When measuring angles, one should put the centre of the protractor on the _____________________.
vertex
Construct an isosceles triangle.
(two sides equal)
A straight line that begins at a point and extends forever in one direction is called a ________.
ray
What is the name for an 8 sided figure?
octogon
A triangle with all equal sides is called ______________.
equilateral
An angle that measures 64 degrees is classified as
______________________.
acute
Construct a right angled triangle.
(90 degrees)
Lines that extend in both directions but never meet are called ______________________lines.
parallel
What is the name for a six sided figure?
hexagon
A triangle with all three acute angles is called
__________________.
acute
An angle that measures 126 degrees is classified as
_______________________.
obtuse
Construct a triangle with a base of 7 cm and an angle of 45 degrees.
(DID YOU USE A RULER AND PROTRACTOR?)
Lines that intersect at right angles are called _______________________ lines.
perpendicular
When are 2 polygons considered congruent?
2 polygons are congruent when they have the same size and shape.
A triangle with two equal sides is called
_____________________.
isosceles
An angle that measures 90 degrees is classified as
_______________________________
right
Construct a triangle with a base of 5 cm and an angle of 130 degrees.
(DID YOU USE A RULER AND A PROTRACTOR?)
A regular polygon with 5 lines of symmetry is called a _____________________.
pentagon
Name 5 properties of polygons.
1.Side lengths
2.Equal side lengths
3.Number of vertices
4.Number of edges
5.Acute angles, right angles, obtuse angles,
6.Number of parallel lines
7.Number of lines of symmetry
What is the name for a triangle with three sides of a different length?
scalene
What is the total of all three angles in the interior of a triangle?
180 degrees
Construct a triangle with a base of 7 cm, a side of 5 cm. and an angle of 45 degrees.
(DRAW CAREFULLY!)
What is the purpose of a Venn diagram?
A Venn diagram is an effective way to sort polygons (or other things) and show similarities and differences in their properties.