Wednesday, December 3, 2014

Math lesson 9 areas square rectangle triangle

Areas are the opposite to perimeters. Areas are whats inside the space.

This is also another good strategy for a architect.

To work out an area of a square you have to do side squared - thats how long the side is and times it by itself.

 For a rectangle you have to times the width by the hight so its w Times h.


Here are some of my practices

Square - side = 4  Area = 16
side = 10  Area = 40
side = 24  Area = 96

Rectangle
width = 2  hight = 4  Area = 8
width = 6  hight = 10  Area = 60
width = 12  hight = 30  Area = 360

Triangle
Area = ½ × b × h
b = base
h = vertical height
Square
Area = a2
a = length of side
Rectangle
Area = w × h
w = width
h = height
Parallelogram
Area = b × h
b = base
h = vertical height
Trapezoid (US)
Trapezium (UK)
Area = ½(a+b) × h
h = vertical height
Circle 
Area = π × r2
Circumference = 2 × π × r
r = radius
Ellipse
Area = πab
Sector
Area = ½ × r2 × θ 
r = radius
θ = angle in radians
Note: h is at right angles to b:

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