Finding the perimeter of an object?

Answer 1

It depends what geometric shape the object is.

Shapes

FormulaRectangle:

Area = Length X Width

A = lw

Perimeter = 2 X Lengths + 2 X Widths

P = 2l + 2wParallelogram

Area = Base X Height

a = bhTriangle

Area = 1/2 of the base X the height

a = 1/2 bh

Perimeter = a + b + c

(add the length of the three sides)Trapezoid

Perimeter = area + b1 + b2 + c

P = a + b1 + b2 + cCircle Try the Online tool.

The distance around the circle is a circumference. The distance across the circle is the diameter (d). The radius (r) is the distance from the center to a point on the circle. (Pi = 3.14) More aboutcircles.

d = 2r

c = pd = 2 pr

A = pr2

(p=3.14)

Rectangular Solid

Volume = Length X Width X Height

V = lwh

Surface = 2lw + 2lh + 2whPrisms

Volume = Base X Height

v=bh

Surface = 2b + Ph (b is the area of the base P is the perimeter of the base)Cylinder

Volume = pr2 x height

V = pr2 h

Surface = 2p radius x height

S = 2prh + 2pr2Pyramid

V = 1/3 bh

b is the area of the base

Surface Area: Add the area of the base to the sum of the areas of all of the triangular faces. The areas of the triangular faces will have different formulas for different shaped bases.Cones

Volume = 1/3 pr2 x height

V= 1/3 pr2h

Surface = pr2 + prs

S = pr2 + prs

=pr2 + prSphere

Volume = 4/3 pr3

V = 4/3 pr3

Surface = 4pr2

S = 4pr2