Transcript 2 D AND 3 D SHAPES & FORMULAS 2 D AND 3 D SHAPES & FORMULAS Click on the link. Area and.

2 D AND 3 D SHAPES & FORMULAS
2 D AND 3 D SHAPES & FORMULAS
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Area and Perimeter of a Triangle
2 D AND 3 D SHAPES &
FORMULAS
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Squares and rectangles
Perimeter is the distance around a figure. For a rectangle or square, we can
find the perimeter using two procedures:
Using addition: (l + l) + (w + w). Add the length and its opposite side. Add the
width to its opposite. Find the sum of the lengths and widths. For a square
use (s+s+s+s) .
Using multiplication: (l x 2) + (w x 2). Multiply the length by 2. Multiply the width
by 2. Find the sum of the products. For a square use 4 s because all the
sides are congruent.
Area is the number of square units inside a retangle or square. Area is found
by multiplying the length by the width or side by side in the case of a square.
A=lxw
A=sxs
2 D AND 3 D SHAPES & FORMULAS
A trapezoid is a 4-sided flat shape with straight sides that has a pair of opposite sides
parallel.
The Perimeter is the
sum of all side lengths:
Perimeter = a+b+c+d
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Perimeter of a Trapezoid
The Perimeter is the distance around the edges.
Example: A trapezoid has side length of 5 cm, 12 cm, 4 cm and 15
cm, what is its Perimeter?
Perimeter = 5 cm + 12 cm + 4 cm + 15 cm = 36 cm
Area of a Trapezoid
The Area is the average of the two base lengths times the altitude
A = (a + b)
X h
2
2 D AND 3 D SHAPES & FORMULAS
2 D AND 3 D SHAPES & FORMULAS
2 D AND 3 D SHAPES & FORMULAS
CIRCUMFERENCE
The circumference of a circle is the distance
around the outside of the circle. It could be
called the perimeter of the circle.
How to find the circumference of a circle:
The circumference of a circle can be found by
multiplying pi ( π = 3.14 ) by the diameter of the
circle.
If you know the radius, the diameter is twice as
large.
2 D AND 3 D SHAPES & FORMULAS
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arv4Click on this link.
2 D AND 3 D SHAPES & FORMULAS
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GQI Click on this link
2 D and 3 D Shapes & Formulas
2 D and 3 D Shapes & Formulas
Surface area of a rectangular prism
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B3nc Click on this surface area link
Volume of a rectangular prism
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2 D AND 3 D SHAPES & FORMULAS
2 D and 3 D Shapes & Formulas
http://www.youtube.com/watch?v=Aigefhb1NM&NR=1&feature=endscreen Click on this surface area part1link
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ure=iv&src_vid=Aigefhb-1NM&v=T6VxjB7bS5o Click on this surface
area part 2 link
http://www.youtube.com/watch?v=8QDmHVEcSfk Click on this
volume link
2 D AND 3 D SHAPES & FORMULAS