Perimeter and Area

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Year 9 Measurement and Space

Last updated 1:58 AM on 4/16/26
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21 Terms

1
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Perimeter

The total length around the border of a closed shape.

2
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Perimeter (Triangle) =

a + b + c

<p>a + b + c</p>
3
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Perimeter (Quadrilateral) =

a + b + c + d

<p>a + b + c + d</p>
4
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Perimeter (Square) =

4s

<p>4s</p>
5
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Perimeter (Circle) =

2πr

<p>2πr</p>
6
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Arc Length =

2πr x (θ/360)

<p>2πr x (<span>θ/360)</span></p>
7
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Perimeter (Parallelogram) =

2(L+W)

<p>2(L+W)</p>
8
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Perimeter (Rectangle) =

2(L+W)

<p>2(L+W)</p>
9
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Area

the amount of space inside a shape

10
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Area (Triangle) =

(1/2)bh

<p>(1/2)bh</p>
11
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Area (Square) =

s²

<p>s²</p>
12
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Area (Rectangle) =

L x W

<p>L x W</p>
13
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Area (Parallelogram) =

b x h

<p>b x h</p>
14
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Area (Kite) =

(1/2) zy

<p>(1/2) zy</p>
15
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Area (Trapezium) =

(1/2)(a+b)h

<p>(1/2)(a+b)h</p>
16
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Area (Rhombus)

(1/2)ab

<p>(1/2)ab</p>
17
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Area (Circle) =

πr²

<p>πr²</p>
18
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Area (Sector)

πr² x (θ/360)

<p>πr² x (<span>θ/360)</span></p>
19
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Area (Semicircle) =

πr² x (1/2)

<p>πr² x (1/2)</p>
20
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conversion between cm², m² and km²

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21
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conversion between cm, m, and km

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