BASIC MENSURATION FORMULA

UNIT-

  You should be familiar with the following units:

1.              Length: mm, cm, m, km
2.             Area: mm2, cm2, m2, ha, km2
3.             Volume: mm3, cm3, m3
4.             Capacity: ml, cl, l
5.             Mass: g, kg

•        To convert from smaller to larger units we divide by the conversion factor.
•       To convert from larger to smaller units we multiply by the  conversion factor

LENGTH-

                    The perimeter of a figure is the measurement of the distance

                     around its boundary.

                     For a polygon the perimeter is the sum of the lengths of all

                     sides

                     UNIT-METER

AREA-

              The area of a figure is the amount of surface within its

             boundaries.

            You should be able to use these formulae for area

Rectangles- Area = (length * width)

Triangles-Area = 1/2 (base * height)

 Parallelograms-Area = base * height

Trapezia-Area = 1/2 (a + b) * h

VOLUME-

                   The volume of a solid is the amount of space it occupies.You should be able to use these formulae for volume:Solids of uniform cross-section--

Volume of uniform solid = area of end * height

Pyramids and cones= 1/3 (area of base * height)

Volume of a sphere = 4/3(pi)r3

SURFACE AREA

Solids with plane faces

The surface area of a three dimensional figure with plane facesis the sum of the areas of the faces.

To assist in your calculations, you can draw a net of the solid,

correctly labelling the dimensions.

Solids with curved surfaces

You should be able to use these formulae for surface area: