This page 10th samacheer kalvi math solution for exercise 5.3 part 3 is going to provide you solution for every problems that you find in the exercise no 5.3

7. The side BC of an equilateral Δ ABC is parallel to x-axis. Find the slope of AB and the slope of BC

Solution:

The side BC is parallel to x axis.

slope of the side BC = 0

Since this is an equilateral triangle each angle is 60.

m = tan θ

θ = 60

m = tan 60

= √3

(i) (2 , 3), (3 , -1) and (4 , -5)

Solution:

Let A (2,3) B (3 , -1) and C (4,-5) be the given points

If the given points are collinear then,

slope of AB = slope of BC

slope = **(y**** ₂**-y

**x****₁ = 2 ** ** ****x****₂ = 3**

y₁ = 3 y₂ = -1

= (-1-3)/(3-2)

= -4/1

= -4

**slope of AB = -4**

**x****₁ = 3 ** ** ****x****₂ = 4**

y₁ = -1 y₂ = -5

= (-5-(-1))/(4-3)

= (-5+1)/1

= -4

**slope of B C = -4**

Therefore the given points are collinear.

(ii) (4 , 1), (-2 , -3) and (-5 , -5)

Solution:

Let A (4,1) B (-2 , -3) and C (-5,-5) be the given points

If the given points are collinear then,

slope of AB = slope of BC

slope = **(y**** ₂**-y

**x****₁ = 4 ** ** ****x****₂ = -2**

y₁ = 1 y₂ = -3

= (-3-1)/(-2-4)

= -4/(-6)

= 2/3

**slope of AB = 2/3**

**x****₁ = -2 ** ** ****x****₂ = -5**

y₁ = -3 y₂ = -5

= (-5-(-3))/(-5-(-2))

= (-5+3)/(-5+2)

= -2/(-3)

= 2/3

**slope of B C = 2/3**

Therefore the given points are collinear.

In the page 10th samacheer kalvi math solution for exercise 5.3 part 3 we are going to see the solution of next problem

(iii) (4 , 4), (-2 , 6) and (1 , 5)

Solution:

Let A (4,4) B (-2 , 6) and C (1,5) be the given points

If the given points are collinear then,

slope of AB = slope of BC

slope = **(y**** ₂**-y

**x****₁ = 4 ** ** ****x****₂ = -2**

y₁ = 4 y₂ = 6

= (6-4)/(-2-4)

= 2/(-6)

= -1/3

**slope of AB = -1/3**

**x****₁ = -2 ** ** ****x****₂ = 1**

y₁ = 6 y₂ = 5

= (5-6)/(1-(-2))

= (-1)/(1+2)

= -1/3

**slope of B C = -1/3**

Therefore the given points are collinear.

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