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The equation of an altitude of an equila...

The equation of an altitude of an equilateral triangle is `sqrt3x + y = 2sqrt3` and one of its vertices is `(3,sqrt3)` then the possible number of triangles is

A

0,0

B

`0, 2sqrt(3)`

C

`3, -sqrt(3)`

D

none of these

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To solve the problem, we need to find the possible number of equilateral triangles given the altitude and one vertex. Let's break down the steps: ### Step 1: Understand the given information We have the equation of the altitude of an equilateral triangle given by: \[ \sqrt{3}x + y = 2\sqrt{3} \] and one of its vertices is at the point \( (3, \sqrt{3}) \). ### Step 2: Verify if the vertex lies on the altitude We will check if the vertex \( (3, \sqrt{3}) \) satisfies the altitude equation: \[ \sqrt{3}(3) + \sqrt{3} = 2\sqrt{3} \] Calculating the left-hand side: \[ 3\sqrt{3} + \sqrt{3} = 4\sqrt{3} \] Since \( 4\sqrt{3} \neq 2\sqrt{3} \), the vertex does not lie on the altitude. This means the vertex can either be point B or point C of the triangle. ### Step 3: Determine the slope of the altitude The altitude's equation can be rearranged to find its slope: \[ y = -\sqrt{3}x + 2\sqrt{3} \] The slope of the altitude is \( -\sqrt{3} \). ### Step 4: Find the slope of the sides of the triangle Since the triangle is equilateral, the angles between the altitude and the sides are \( 60^\circ \). The slopes of the sides can be calculated as follows: - The slope of one side (let's say BC) will be \( \tan(60^\circ) = \sqrt{3} \). - The slope of the other side (let's say AB) will be \( \tan(-60^\circ) = -\sqrt{3} \). ### Step 5: Find the equations of the sides Using the vertex \( (3, \sqrt{3}) \) and the slopes, we can find the equations of the two sides: 1. For side AB with slope \( \sqrt{3} \): \[ y - \sqrt{3} = \sqrt{3}(x - 3) \] Simplifying gives: \[ y = \sqrt{3}x - 3\sqrt{3} + \sqrt{3} = \sqrt{3}x - 2\sqrt{3} \] 2. For side AC with slope \( -\sqrt{3} \): \[ y - \sqrt{3} = -\sqrt{3}(x - 3) \] Simplifying gives: \[ y = -\sqrt{3}x + 3\sqrt{3} + \sqrt{3} = -\sqrt{3}x + 4\sqrt{3} \] ### Step 6: Find the intersection points To find the other vertices (B and C), we need to find the intersection points of these lines with the altitude line: 1. Set \( \sqrt{3}x - 2\sqrt{3} = -\sqrt{3}x + 4\sqrt{3} \) and solve for \( x \). 2. Substitute \( x \) back into either line to find \( y \). ### Step 7: Determine the possible triangles Since the altitude is fixed and the vertex can be either B or C, we can reflect the triangle across the altitude to find the second possible triangle. Therefore, the maximum number of distinct equilateral triangles that can be formed is 2. ### Conclusion The possible number of equilateral triangles that can be formed is: \[ \text{Possible number of triangles} = 2 \]

To solve the problem, we need to find the possible number of equilateral triangles given the altitude and one vertex. Let's break down the steps: ### Step 1: Understand the given information We have the equation of the altitude of an equilateral triangle given by: \[ \sqrt{3}x + y = 2\sqrt{3} \] and one of its vertices is at the point \( (3, \sqrt{3}) \). ...
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CENGAGE ENGLISH-STRAIGHT LINES-EXERCISE (LINKED COMPREHENSION TYPE)
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