PHY1: AREA

AREA

Area is the region under or within a boundary of an object. Area is measured in square units e.g. cm³, m², mm².

Where

1km² =? m²

[1km]² = [1000m]²

1km² = 1000m x 1000m

1km² = 1,000,000m²

And

1m² =? cm²

[1m] ² = [100cm]²

1m² = 1000cm x 100cm

1m² = 10,000cm²

FORMULAE FOR FINDING AREA OF OBJECTS

Object

Formulae

1/2  x b x h

Rectangle

Formulae

            Length x width

Square

Formulae

1/2 x r²

 Quadrant

Formulae

1/4 x r²

SURFACE AREA

It is the total area around the surface of an object. It is obtained by either adding up the area of the faces on using formulae.

EXAMPLES

Formulae

2 x r2   = [r +h]

xr2