# PHY1: AREA

##### This Unit is about the Area as calculated in O level Physics.

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 ## STEM Elearning

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