Chapter 9 · Class 9 CBSE · Formula Sheet
Areas of Parallelograms & Triangles Formulas — Class 9 CBSE
Prove theorems relating areas of figures on the same base and between the same parallels.
Key Formulas
SSS Congruence
\text{Three sides equal}
SAS Congruence
\text{Two sides and included angle equal}
ASA Congruence
\text{Two angles and included side equal}
AAS Congruence
\text{Two angles and a non-included side equal}
RHS Congruence
\text{Right angle, hypotenuse, and one side equal}
Worked Examples
1Using: Area of Rectangle
Find the area of a rectangle with length 12 cm and breadth 5 cm.
Step 1: Area = l x b
Step 2: = 12 x 5 = 60 sq. cm.
Answer: 60 sq. cm
2Using: Perimeter of Square
Find the perimeter of a square with side 8 m.
Step 1: Perimeter = 4a
Step 2: = 4 x 8 = 32 m.
Answer: 32 m
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