All sides are equal in length.
Equilateral Triangle
Draw an acute triangle.
All angles have to be less than 90°
what is a polygon with 8 sides called.
an octagon
What is the perimeter of this picture.
43 cm
What is the formula for area?
A = l x w
Two sides are equal in length
Isosceles triangle
How many acute angles are in an obtuse triangle?
2
draw a concave polygon
see board
What is the perimeter of this
36cm
What is the formula for volume?
V = l x w x h
No sides are the same length.
scalene triangle
Draw an obtuse triangle
see board
draw a regular polygon and define a regular polygon.
A regular polygon has the exact same side lengths and angles.
What is the perimeter of this
22cm
Find the volume of this
72 cm3
How many angles are the same in an isosceles triangle?
2
Draw a right triangle. How many angles are acute?
Has 1 90° angle. 2 acute angles.
Draw a convex polygon
All angles are pointing out.
What is the area
24cm2
Find the volume
120 cm3
Draw examples of an equilateral, isosceles and scalene triangle.
E - all angles are the same and side lengths are the same
I - 2 angles and side lengths are the same
S - No angles or side lengths are the same
Does an obtuse triangle have two obtuse angles? Why or why not?
2 obtuse angles is greater than 180°
A regular polygon with four sides is called a what?
a square
Rectangle length = 7cm, area = 35cm2
What is the width?
35 ÷ 7 = 5cm
Find the height?
volume = 24cm3
length = 6cm
width = 2 cm
2 cm