Maths : Mensuration: Points to Remember

**Points to Remember**

**â€¢ **If *a*, *b* and *c* are
the sides of a triangle, then the area of a triangle *= âˆš *[ *s*(*s *âˆ’*
a*)(*s *âˆ’*
b*)(*s *âˆ’*
c*)]* **sq.units*, where* s *=* *(*a *+*
b *+*
c*) /*2*.

**â€¢ **If the length,
breadth and height of the cuboid are *l*, *b* and *h* respectively,
then

(i)
Total Surface Area(TSA) = 2( *lb* +
*bh* + *lh*) *sq.units*

(ii)
Lateral Surface Area(LSA) = 2( *l* +
*b*)*h* *sq.units*

**â€¢ **If the side
of a cube is â€˜*aâ€™* units, then

(i)
Total Surface Area(TSA) = 6*a*^{2} sq.units

(ii)
Lateral Surface Area(LSA) = 4*a*^{2} sq.units

**â€¢ **If the length,
breadth and height of the cuboid are *l*, *b* and *h* respectively,
then the Volume of the cuboid (*V* ) = *lbh* cu.units

**â€¢ **If the side of a cube is â€˜*aâ€™* units
then, the Volume of the cube (*V* ) = *a*^{3} cu.units.

** **

Tags : Mensuration | Maths , 9th Maths : UNIT 7 : Mensuration

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9th Maths : UNIT 7 : Mensuration : Points to Remember | Mensuration | Maths

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