**Vertices of rhombus question3 :**

Here we are going to see practice question on vertices of parallelogram.

**Definition of rhombus :**

A quadrilateral which is having four equal sides is called rhombus. In other words a parallelogram will become rhombus if the diagonals are perpendicular.

(i) First we have to find the length of all sides using distance between two points formula.

(ii) Length of diagonal must be equal in any square.So we need to prove this the length of diagonals are not same.If the given vertices are satisfying these conditions then we can say the given vertices forms a rhombus.

**Question 3 :**

Examine whether the given points A (1,1) and B (2,1) and C (2,2) and D (1,2) forms a rhombus.

**Solution :**

To show that the given points forms a square we need to find the distance between the given points.

Distance Between Two Points (x ₁, y₁) and (x₂ , y₂)

**√(x₂ - x₁)² + (y₂ - y₁)²**

Four points are A (1,1) and B (2,1) and C (2,2) and D (1,2)

Distance between the points A and B

= **√(x₂ - x₁)² + (y₂ - y₁)²**

Here **x₁ = 1, y₁ = 1, x₂ = 2 and y₂ = 1**

**= ** √(2-1)² + (1-1)²

= √(1)² + (0)²

= ** **√1

= 1 unit

Distance between the points B and C

= **√(x₂ - x₁)² + (y₂ - y₁)²**

Here **x₁ = 2, y₁ = 1, x₂ = 2 and y₂ = 2**

**= ** √(2-2)² + (2-1)²

= √(0)² + (1)²

= ** **√0 + 1

= 1 unit

Distance between the points C and D

= **√(x₂ - x₁)² + (y₂ - y₁)²**

Here **x₁ = 2, y₁ = 2, x₂ = 1 and y₂ = 2**

**= ** √(1-2)² + (2-2)²

= √(-1)² + (0)²

= ** **√(1) + 0

= 1 unit

Distance between the points D and A

= **√(x₂ - x₁)² + (y₂ - y₁)²**

Here **x₁ = 1, y₁ = 2, x₂ = 1 and y₂ = 1**

**= ** √(1-1)² + (1-2)²

= √(0)² + (-1)²

= ** **√0 + 1

= 1 unit

AB = 1 unit

BC = 1 unit

CD = 1 unit

DA = 1 unit

Length of opposite sides are equal.To test whether it forms right triangle we need to find the length of diagonal AC and BD.

Distance between the points A and C

= **√(x₂ - x₁)² + (y₂ - y₁)²**

Here **x₁ = 1, y₁ = 1, x₂ = 2 and y₂ = 2**

**= ** √(2-1)² + (2-1)²

= √(1)² + (1)²

= ** **√1 + 1

= √2 units

Distance between the points B and D

= **√(x₂ - x₁)² + (y₂ - y₁)²**

Here **x₁ = 2, y₁ = 1, x₂ = 1 and y₂ = 2**

**= ** √(1-2)² + (2-1)²

= √(-1)² + (1)²

= ** **√1 + 1

= √2 units

Length of all sides and diagonals are not equal so the given vertices will not form a rhombus.

(1) Examine whether the given points A (2,-3) and B (6,5) and C (-2,1) and D (-6,-7) forms a rhombus.

(2) Examine whether the given points A (1,4) and B (5,1) and C (1,-2) and D (-3,1) forms a rhombus.

(3) Examine whether the given points A (1,1) and B (2,1) and C (2,2) and D (1,2) forms a rhombus.

- Solution for vertices of rhombus question1
- Solution for vertices of rhombus question2
- Solution for vertices of rhombus question3

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