Mensuration
Category : 5th Class
Mensuration
The total boundary length of a closed figure is called its perimeter. It is expressed in usual units of measurement of length.
The amount of surface enclosed by a closed figure is called its area.
(a) Area is measured in square units.
(b) 1 m = 100 cm; 1 sq. m = 10000 sq. cm;
(c) 1 cm = 10 mm; 1 sq. cm = 100 sq. mm
The space occupied by an object is called its volume.
(a) Volume is measured in cubic units.
(b) 1 cu m = 1000000 cu cm;
(c) 1 cu cm = 1000 cu mm
It is a solid figure with 6 square surfaces.
It is a solid figure with 6 rectangular surfaces.
V =\[l\] × b × h
\[\therefore l=\frac{\text{V}}{\text{bh}};\] \[b=\frac{\text{V}}{l\text{h}};\] \[\text{h}=\frac{\text{V}}{l\text{b}};\]
The net of a cube has 6 squares.
The net of a cuboid has 6 rectangles.
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