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Published byMerry McCarthy Modified over 8 years ago

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Geometric Formulas RectangleSquare Parallelogram Triangle Ch. 5: 2 – D Measurement Trapezoid

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PERIMETER & AREA of a SQUARE P= 4s A= s²s² s s Example: Find the Perimeter and the Area of the following Square 3 cm A= s² A= 3 cm x 3 cm A = 9 cm ² P = 4s P = 4 x 3 cm P = 12 cm

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PERIMETER & AREA OF A RECTANGLE P = 2l + 2w l w P = 2 (l + w) OR A = l w A = l x w P=2l+2w P=2(3m) + 2 (2m) P=6 m + 4 m P=10 m A= l x w A=3 m x 2 m A= 6 m²m² 2 m 3 m Example: Find the Perimeter and the Area of the following rectangle

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PERIMETER & AREA OF A PARALLELOGRAM P = 2b + 2s b is the base, s is the side & h is the height b s A= b h b x h OR h

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Perimeter of a Parallelogram P=2b+2s P=2 (12 m) + 2 (9 m) P= 24 m + 18 m P= 42 m 9 m 12 m Area of a Parallelogram A= b x h 12 m x 6 m A= 72 m²m² 6 m

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PERIMETER OF A TRIANGLE P = 3s (s + s + s) b 1. Equilateral Triangle s 2. Isosceles Triangle a c P= a + b + c

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AREA OF A TRIANGLE A=1 b h 2 b h OR A= b x h 2

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Perimeter of a Triangle P = a + b + c P = 8cm +10cm + 6cm P= 24 cm 8cm 6cm 10cm Area of a Triangle A= ½ b h 6cm x 8cm = 48 cm² 2 2 A= 24 cm ²

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PERIMETER & AREA OF A TRAPEZOID P = a+ b + c + d A = a + b x h 2 a b h Example: Find the Perimeter and the Area of the following trapezoid. 6 cm 3 cm 5 cm 4 cm P = a+ b + c + d = 6 + 3 + 5 + 5 = 19 cm A = a + b x h 2 = 6 + 3 x 4 2 = 9 x 4 = 36 cm² = 18 cm² 2 2

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