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Published byRoland Harvey Modified over 9 years ago

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Facts about Area of Shapes Dr. Kent Bryant 5/2011

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SQUARE IF A SQUARE HAS SIDES WITH LENGTH L THEN AREA = L X L EG. WHAT IS THE AREA OF A SQUARE WITH LENGTH 20 cm? Area = 20 cm X 20 cm = 400 cm2 L L

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RECTANGLE L W IF A RECTANGLE HAS LENGTH L AND WIDTH W A = L X W EG. WHAT IS THE AREA OF A RECTANGLE WITH LENGTH 20cm AND WIDTH 40cm? Area =20 cm x 40 cm = 800 cm2

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Triangle H B IF A TRIANGLE HAS HEIGHT H AND BASE B AREA = ½ B X H EG. WHAT IS THE AREA OF A TRIANGLE WITH HEIGHT 20 cm AND BASE 15 cm? Area = ½ x 20 x 15 – 150 cm2

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Circumference of a Circle The circumference of a circle is the distance around the circle Circumference = Diameter X π (C = π d) π = 3.14 Circumference = 2πr (r = radius) What is the circumference of a circle with radius 5 cm? C = 2πr = 2 X 3.14 X 5 = 31.4 cm The diameter of a circle is the distance across the circle through the center point. The radius of a circle is the distance from the center to the outer edge of the circle. Diameter = 2 X radius

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Area of a Circle If a circle has a radius R then Area = π R2 Eg. What is the area of a circle with radius 10 cm? Area = 3.14 X 10 X 10 = 314 cm2 R

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Area of Parallelogram B B H If a Parallelogram has height H and a base length of B then Area -= B X H Eg. What is the area of a Parallelogram with Height 10 cm and Base length 20cm? Area – B X H = 20 cm X 10 cm =200 cm2

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What about Irregular Shapes? How do you find the area of this shape? First – Break shape into smaller REGULAR shapes. In this case a rectangle and two triangles. Now find the area of these smaller shapes. Add all three areas together to get your answer.

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What about Irregular Shapes? How do you find the area of this shape? First – Break shape into smaller REGULAR shapes. In this case five rectangles. Now find the area of these smaller shapes. Add all five areas together to get your answer.

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