Download Geometry Shapes and Formulas Triangle

Geometry Shapes and Formulas
Triangle – 3 sided figure, the height MUST be from the top angle
down to the base, at a right angle.
Area = ½ b x h
Perimeter: add up the length of all sides
Rectangle – 4 sides, opposite sides are equal and parallel, 4 right
angles.
Area = b x h
Perimeter: add up all sides, or P = 2(L + w)
Square – similar to a rectangle, only all sides are the same length.
Area = s x s or s2 Perimeter = 4s
Parallelogram – 4 sides, opposite sides are equal and parallel, NO
right angles. Height is a line from top to bottom that meets both at a
right angle.
Area = b x h
Perimeter: add up all sides, or P = 2(L + w)
Trapezoid – 4 sides, only one pair of parallel sides. Other two sides
are not the same length.
Area = ½ x h (b1 + b2)
Perimeter = add up all of the sides
Surface Area of Rectangular Prisms
This is the sum of the areas of all six faces. Since the front and back
are the same dimensions (and the same area), and so are the top
and bottom, and also the two sides, use the following formula:
S = 2lw + 2 lh + 2 wh
Surface Area is measured in square units.
Volume of Rectangular Prisms
This is the amount of space occupied by the prism, or how many unit
cubes would fit inside it. The formula is:
V=lxwxh
Volume is measured in cubic units.