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Pattern

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Geometric Shapes Perimeter Formulas

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StarStarStarStar

Rhombus

StarStarStarStar

P=4×sideP = 4 \times \text{side}

StarStarStarStar

Pentagon

StarStarStarStar

P=5×sideP = 5 \times \text{side}

StarStarStarStar

Rhomboid

StarStarStarStar

P=2×(base+height)P = 2 \times (\text{base} + \text{height})

StarStarStarStar

Rectangle

StarStarStarStar

P=2×(length+width)P = 2 \times (\text{length} + \text{width})

StarStarStarStar

Circle

StarStarStarStar

P=2π×radiusP = 2 \pi \times \text{radius}

StarStarStarStar

Parallelogram

StarStarStarStar

P=2×(base+side)P = 2 \times (\text{base} + \text{side})

StarStarStarStar

Octagon

StarStarStarStar

P=8×sideP = 8 \times \text{side}

StarStarStarStar

Nonagon

StarStarStarStar

P=9×sideP = 9 \times \text{side}

StarStarStarStar

Dodecagon

StarStarStarStar

P=12×sideP = 12 \times \text{side}

StarStarStarStar

Ellipse

StarStarStarStar

P2πa2+b22P \approx 2\pi \sqrt{\frac{\text{a}^2 + \text{b}^2}{2}}

StarStarStarStar

Kite

StarStarStarStar

P=2×(side1+side2)P = 2 \times (\text{side}_1 + \text{side}_2)

StarStarStarStar

Hexagon

StarStarStarStar

P=6×sideP = 6 \times \text{side}

StarStarStarStar

Regular Polygon (n sides)

StarStarStarStar

P=n×sideP = n \times \text{side}

StarStarStarStar

Star

StarStarStarStar

Depends on the type of star

StarStarStarStar

Square

StarStarStarStar

P=4×sideP = 4 \times \text{side}

StarStarStarStar

Triangle

StarStarStarStar

P=side1+side2+side3P = \text{side}_1 + \text{side}_2 + \text{side}_3

StarStarStarStar

Equilateral Triangle

StarStarStarStar

P=3×sideP = 3 \times \text{side}

StarStarStarStar

Trapezoid (US) / Trapezium (UK)

StarStarStarStar

P=side1+side2+base1+base2P = \text{side}_1 + \text{side}_2 + \text{base}_1 + \text{base}_2

StarStarStarStar

Decagon

StarStarStarStar

P=10×sideP = 10 \times \text{side}

StarStarStarStar

Heptagon

StarStarStarStar

P=7×sideP = 7 \times \text{side}

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