Home
Class 11
MATHS
Find the area and nature of the triangle...

Find the area and nature of the triangle formed by the points represented by the complex numbers ` (3+3i),(-3-3i) and (-3sqrt(3)+3sqrt(3)i)`.

Text Solution

AI Generated Solution

The correct Answer is:
To find the area and nature of the triangle formed by the points represented by the complex numbers \( z_1 = 3 + 3i \), \( z_2 = -3 - 3i \), and \( z_3 = -3\sqrt{3} + 3\sqrt{3}i \), we can follow these steps: ### Step 1: Identify the coordinates of the points The complex numbers can be represented as points in the Cartesian plane: - \( z_1 = 3 + 3i \) corresponds to the point \( (3, 3) \) - \( z_2 = -3 - 3i \) corresponds to the point \( (-3, -3) \) - \( z_3 = -3\sqrt{3} + 3\sqrt{3}i \) corresponds to the point \( (-3\sqrt{3}, 3\sqrt{3}) \) ### Step 2: Use the formula for the area of a triangle The area \( A \) of a triangle formed by the points \( (x_1, y_1) \), \( (x_2, y_2) \), and \( (x_3, y_3) \) can be calculated using the formula: \[ A = \frac{1}{2} \left| x_1(y_2 - y_3) + x_2(y_3 - y_1) + x_3(y_1 - y_2) \right| \] Substituting the coordinates: - \( x_1 = 3, y_1 = 3 \) - \( x_2 = -3, y_2 = -3 \) - \( x_3 = -3\sqrt{3}, y_3 = 3\sqrt{3} \) The area becomes: \[ A = \frac{1}{2} \left| 3(-3 - 3\sqrt{3}) + (-3)(3\sqrt{3} - 3) + (-3\sqrt{3})(3 - (-3)) \right| \] ### Step 3: Calculate the area Calculating each term: 1. \( 3(-3 - 3\sqrt{3}) = -9 - 9\sqrt{3} \) 2. \( -3(3\sqrt{3} - 3) = -9\sqrt{3} + 9 \) 3. \( -3\sqrt{3}(3 + 3) = -18\sqrt{3} \) Now, combine these: \[ A = \frac{1}{2} \left| (-9 - 9\sqrt{3}) + (-9\sqrt{3} + 9) + (-18\sqrt{3}) \right| \] \[ = \frac{1}{2} \left| -9 - 9\sqrt{3} - 9\sqrt{3} - 18\sqrt{3} + 9 \right| \] \[ = \frac{1}{2} \left| -36\sqrt{3} \right| = 18\sqrt{3} \] ### Step 4: Determine the nature of the triangle To determine the nature of the triangle, we calculate the lengths of the sides using the distance formula: \[ d = \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2} \] 1. **Distance \( z_1 \) to \( z_2 \)**: \[ d_{12} = \sqrt{((-3) - 3)^2 + ((-3) - 3)^2} = \sqrt{(-6)^2 + (-6)^2} = \sqrt{36 + 36} = 6\sqrt{2} \] 2. **Distance \( z_2 \) to \( z_3 \)**: \[ d_{23} = \sqrt{((-3\sqrt{3}) - (-3))^2 + (3\sqrt{3} - (-3))^2} \] Calculating: \[ = \sqrt{(-3\sqrt{3} + 3)^2 + (3\sqrt{3} + 3)^2} \] Let \( a = 3 \) and \( b = 3\sqrt{3} \): \[ = \sqrt{(3 - 3\sqrt{3})^2 + (3 + 3\sqrt{3})^2} = \sqrt{(3(1 - \sqrt{3}))^2 + (3(1 + \sqrt{3}))^2} \] \[ = 6\sqrt{2} \] 3. **Distance \( z_3 \) to \( z_1 \)**: \[ d_{31} = \sqrt{(3 - (-3\sqrt{3}))^2 + (3 - 3\sqrt{3})^2} \] Calculating similarly yields: \[ = 6\sqrt{2} \] ### Conclusion Since all three sides are equal, the triangle is equilateral. ### Final Answer - **Area of the triangle**: \( 18\sqrt{3} \) square units - **Nature of the triangle**: Equilateral

To find the area and nature of the triangle formed by the points represented by the complex numbers \( z_1 = 3 + 3i \), \( z_2 = -3 - 3i \), and \( z_3 = -3\sqrt{3} + 3\sqrt{3}i \), we can follow these steps: ### Step 1: Identify the coordinates of the points The complex numbers can be represented as points in the Cartesian plane: - \( z_1 = 3 + 3i \) corresponds to the point \( (3, 3) \) - \( z_2 = -3 - 3i \) corresponds to the point \( (-3, -3) \) - \( z_3 = -3\sqrt{3} + 3\sqrt{3}i \) corresponds to the point \( (-3\sqrt{3}, 3\sqrt{3}) \) ...
Promotional Banner

Topper's Solved these Questions

  • COMPLEX NUMBERS AND QUADRATIC EQUATION

    NAGEEN PRAKASHAN ENGLISH|Exercise EXERCISE 5D|6 Videos
  • COMPLEX NUMBERS AND QUADRATIC EQUATION

    NAGEEN PRAKASHAN ENGLISH|Exercise EXERCISE 5E|10 Videos
  • COMPLEX NUMBERS AND QUADRATIC EQUATION

    NAGEEN PRAKASHAN ENGLISH|Exercise EXERCISE 5B|29 Videos
  • BINOMIAL THEOREM

    NAGEEN PRAKASHAN ENGLISH|Exercise Miscellaneous Exericse|20 Videos
  • CONIC SECTION

    NAGEEN PRAKASHAN ENGLISH|Exercise Miscellaneous Exercise|8 Videos

Similar Questions

Explore conceptually related problems

Show that the points representing the complex numbers (3+2i),(2-i) and -7i are collinear

Show that the points representing the complex numbers 3+2i, 5i, -3+2i and -i form a square

Represent the complex numbers z= 1 + sqrt3i into polar form

What is the product of the complex numbers (−3i+4) and (3i+4)?

Express in the form of complex number z= (5-3i)(2+i)

Find the sum and product of the complex numbers -sqrt(3)+sqrt(-2) and 2sqrt(3)-i

Find the principal argument of the complex number ((1+i)^5(1+sqrt(3i))^2)/(-2i(-sqrt(3)+i))

Find the principal argument of the complex number ((1+i)^5(1+sqrt(3i))^2)/(-2i(-sqrt(3)+i))

The polar form of the complex number (i^(25))^(3) is

Show that the points representing the complex numbers (3+ 3i), (-3- 3i) and (-3 sqrt3 + 3 sqrt3i) on the Argand plane are the vertices of an equilateral triangle