Perimeter and Area test

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These flashcards cover essential formulas and definitions related to the area and perimeter of various geometric shapes.

Last updated 10:58 PM on 4/11/26

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How do you find the area of a Circle

A = π × r²,

where r is the radius.

•π (pi) is approximately 3.14

•r is the radius (distance from the centre to the edge)

•Square the radius, then multiply by π

•Units are always squared (e.g., cm², m²)

Fluency / Communication Using Symbols:

Find the area of a circle with radius 6cm

Area = π × r²

Area = π × 6² = π × 36 = 36π cm²

<p><strong><u><mark data-color="yellow" style="background-color: yellow; color: inherit;">A = π × r²</mark></u></strong><mark data-color="yellow" style="background-color: yellow; color: inherit;">, </mark></p><p>where r is the radius.</p><p>•π (pi) is approximately 3.14</p><p>•r is the radius (distance from the centre to the edge)</p><p>•Square the radius, then multiply by π</p><p>•Units are always squared (e.g., cm², m²)</p><p><span style="color: blue;"><strong><u>Fluency / Communication Using Symbols:</u></strong></span></p><p style="text-align: left;">Find the area of a circle with radius 6cm</p><p style="text-align: left;">Area = π × r²</p><p style="text-align: left;">Area = π × 6² = π × 36 = 36π cm²</p>

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How do you find the area of a circle with diameter d?

Area of circle = π × r²

•π (pi) is approximately 3.14

•r is the radius (distance from the centre to the edge)

•Divide the diameter by 2 to get the radius

•Square the radius, then multiply by π

•Units are always squared (e.g., cm², m²)

Fluency / Communication Using Symbols:

Find the area of a circle with diameter 12cm

Radius = diameter ÷ 2 = 12 ÷ 2 = 6cm

Area = π × r²

Area = π × 6² = π × 36 = 36π

<p><span><strong><u><mark data-color="yellow" style="background-color: yellow; color: inherit;">Area of circle = π × r²</mark></u></strong></span></p><p><span>•π (pi) is approximately 3.14</span></p><p><span>•r is the radius (distance from the centre to the edge)</span></p><p><span>•<mark data-color="#dbe515" style="background-color: rgb(219, 229, 21); color: inherit;">Divide the diameter by 2 to get the radius</mark></span></p><p><span>•Square the radius, then multiply by π</span></p><p><span>•Units are always squared (e.g., cm², m²)</span></p><p style="text-align: left;"><span style="color: blue;"><strong><u>Fluency / Communication Using Symbols:</u></strong></span></p><p style="text-align: left;"><span>Find the area of a circle with diameter 12cm</span></p><p style="text-align: left;"><span>Radius = diameter ÷ 2 = 12 ÷ 2 = 6cm</span></p><p style="text-align: left;"><span>Area = π × r²</span></p><p style="text-align: left;"><span>Area = π × 6² = π × 36 = 36π</span></p>

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How do you find the Area of a Rectangle?

Area of rectangle = Length × Width

•Length (L): the longer side

•Width (W): the shorter side

•Units are always squared (cm², m²)

Fluency / Communication Using Symbols:

Find the area of this rectangle

•Length = 8 cm

•Width = 5 cm

•Area = Length x Width

•Area = 8 × 5 = 40 cm²

<p><span><mark data-color="yellow" style="background-color: yellow; color: inherit;">Area of rectangle = Length × Width</mark></span></p><p><span>•Length (L): the longer side</span></p><p><span>•Width (W): the shorter side</span></p><p><span>•Units are always squared (cm², m²)</span></p><p style="text-align: left;"><span><strong><u><mark data-color="#e9c841" style="background-color: rgb(233, 200, 65); color: inherit;">Fluency / Communication Using Symbols:</mark></u></strong></span></p><p style="text-align: left;"><span>Find the area of this rectangle</span></p><p><span>•Length = 8 cm</span></p><p><span>•Width = 5 cm</span></p><p><span>•Area = Length x Width</span></p><p><span>•Area = 8 × 5 = 40 cm²</span></p>

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Perimeter of a Rectangle

The perimeter of a rectangle is calculated by 2 × (Length + Width).

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Area of a Triangle

The area of a triangle is calculated using the formula A = ½ × base × height.

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Perimeter of a Square

The perimeter of a square is calculated using the formula P = 4 × side length.

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Area of a Trapezoid

The area of a trapezoid is calculated using the formula A = ½ × (a + b) × h, where a and b are the lengths of the parallel sides.

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Circumference of a Circle

The circumference of a circle can be found using the formulas C = 2 × π × radius or C = π × diameter.

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Perimeter of a Regular Hexagon

The perimeter is calculated as P = 6 × s, where s is the side length.

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Perimeter of an Equilateral Triangle

The perimeter is calculated as P = 3 × side length.

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