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
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