# Important Mensuration formulas Part-1 for SSC, BANK PO, Bank Clerk and Railway

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### 1.Rectangle:

Area = l × b

Perimeter = 2(l + b)

Diagonal = (l² + b²)

Area = a2

Perimeter = 4a

Diagonal = a2

### 3. Triangle:

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s =
 (a + b + c) 2      .

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Area = [s (s − a) (s − b) (s − c)]

Perimeter = a + b + c

### 4.Right angle triangle:

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Area =
 b × h 2   .

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(AC)² = (AB)² + (CA)²

Perimeter = Sum of all sides

∠ABC = 90

### 5. Equilateral triangle:

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h =
 √3 × a 2    .

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Area =
 √3 × a2 4    .

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Perimeter= 3a

∠ABC = ∠BCA = ∠ CAB = 60Ëš

### 6. Isosceles triangle:

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h =
 1 2
(4a² − b²)

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Area =
 b 4
(4a² − b²)

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Perimeter = a + a + b

### 7. Isosceles right angle triangle:

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Area =
 a2 2

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Perimeter= Sum of all sides

∠ABC = 90Ëš

∠ACB = ∠BCA = 45Ëš

### 8. Parallelogram:

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Area = h × b

Perimeter = 2(a + b)

### 9. Rhombus:

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Area =
 1 2
d1d2

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Perimeter= 4a

∠AOB= ∠ BOC= ∠COD= ∠DOA=90Ëš

Area =
 1 2
(a + b)h

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