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Chapter: 9th Maths : UNIT 7 : Mensuration

Points to Remember

Maths : Mensuration: Points to Remember

Points to Remember

If a, b and c are the sides of a triangle, then the area of a triangle = √ [ s(s a)(s b)(s c)] sq.units, where s = (a + b + c) /2.

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

If the side of a cube is ‘a’ units, then

(i) Total Surface Area(TSA) = 6a2 sq.units

(ii) Lateral Surface Area(LSA) = 4a2 sq.units

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

If the side of a cube is ‘a’ units then, the Volume of the cube (V ) = a3 cu.units.

 

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