Here we will learn how to find the area of rhombus.

ABCD is a rhombus whose base AB = b, DB ⊥ AC DB = d₁ AC = d₂ and the altitude from C on AB is CE, i.e., h.

Area of rhombus ABCD = 2 Area of ∆ ABC

= 2 × 1/2 AB × CD sq units.

= 2 × 1/2 b × h sq. units

= base x height sq. units

Also, area of rhombus = 4 × area of ∆ AOB

= 4 × 1/2 × AO × OB sq. units

= 4 × 1/2 × 1/2 d₂ × 1/2 d₁ sq. units

= 4 × 1/8 d₁ × d₂ square units

= 1/2 × d₁ × d₂; **where d₁ and d₂ are diagonals.**

Therefore, area of rhombus = 1/2 (product of diagonals) square units

• Perimeter of rhombus = 4 × side

Worked-out examples on area of rhombus:

**1. ** Find the area of the rhombus having each side equal to 17 cm and one of its diagonals equal to 16 cm.

** Solution:**

ABCD is a rhombus in which AB = BC = CD = DA = 17 cm

AC = 16 cm

Therefore, AO = 8 cm

In ∆ AOD,

AD² = AO² + OD²

⇒ 17² = 8² + OD²

⇒ 289 = 64 + OD²

⇒ 225 = OD²

⇒ OD = 15

Therefore, BD = 2 OD

= 2 × 15

= 30 cm

Now, area of rhombus

= 1/2 × d₁ × d₂

= 1/2 × 16 × 30

= 240 cm²

** 2. ** Find the altitude of the rhombus whose area is 315 cm² and its perimeter is 180 cm.

** Solution:**

Since, the perimeter of rhombus = 180 cm

Therefore, side of rhombus = P/4 = 180/4 = 45 cm

Now, area of rhombus = b × h

⇒ 315 = 45 × h

⇒ h = 315/45

⇒ h =7 cm

Therefore, altitude of the rhombus is 7 cm.

** 3. ** The floor of building consists of 2000 tiles which are rhombus shaped and each of its diagonals are 40 cm and 25 cm in length. Find the total cost of polishing the floor, if the cost per m² is $5.

** Solution:**

In each rhombus, the tile length of the diagonals = 40 cm and 25 cm

Therefore, area of each tile = 1/2 × 40 × 25 = 500 cm²

Therefore, area of 2000 tiles = 2000 × 500 cm²

= 1000000 cm²

= 1000000/10000 cm²

= 100 m²

For 1 m² cost of polishing = $5 = $5 × 100 = $500.

The formula of perimeter and area of rhombus are explained above with the detailed step-by-step explanation using various examples.

**● ****Mensuration**

**Perimeter and Area of Rectangle**

**Area and Perimeter of the Triangle**

**Area and Perimeter of the Parallelogram**

**Circumference and Area of Circle**

**Practice Test on Area and Perimeter of Rectangle**

**Practice Test on Area and Perimeter of Square**

● **Mensuration - Worksheets**

**Worksheet on Area and Perimeter of Rectangles**

**Worksheet on Area and Perimeter of Squares**

**Worksheet on Circumference and Area of Circle**

**Worksheet on Area and Perimeter of Triangle**

**7th Grade Math Problems** **8th Grade Math Practice** **From Area of Rhombus to HOME PAGE**

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