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# Geometry

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### Transcript

• 1. Let’s Play withShapes…In Geometry!
• 2. How do you find the area of a rectangle?l(length)w (width)The formula for Area of arectangle is A=l  w(Area=length  width)**For a square, all sides areequal. So the formula will be A=s  s = s2 (Area= side  side =side2 )ss
• 3. How do you find the area of atriangle?The formula for Area of aTriangle is A= ½ b  h (Area= ½ base  height )Practice!In a triangle with base = 10 in, and height = 6 in, what isthe area?A = ½  (10 in)  (6 in) = 30 in2 The area is 30 in2 .
• 4. How do you find the area of atrapazoid?The formula for the Area of aTrapazoid is A= ½  (b1 + b2 ) h ( Area= ½  ( base1 + base2 ) height )Practice!In a trapazoid with base1 = 5 m, base2 = 3 m, and height = 2 m, what isthe area?Area = ½ (5 m + 3 m)  2 m = ½  8 m  2 m = 8 m2The area is 8 m2 .
• 5. How do you find the area of acircle?The formula for the Area of aCircle isA = π  r2 ( Area = π (pi)  radius2)*The radius is half of the diameter.*The number pi can be replaced by3.14 or 22/7 depending on what isspecified. Using one of thesereplacements can alter your finalanswer by a decimal.*The circumference of a circle (likethe perimeter) is found by theformulaC= 2  π  r
• 6. Let’sPractice!What is the area of a circle with radius = 10 in ?A = 2 π r2A = 2 (3.14) (10)2A = 628 in2The Area is 628 in2 .