Straight Lines
Triangles Formed by Lines
Grade 11
Question:
<p>The straight lines \(3x + y - 4 = 0\), \(x + 3y - 4 = 0\) and \(x + y = 0\) form a triangle which is:</p>
<p>(a) equilateral</p>
<p>(b) right-angled</p>
<p>(c) acute-angled and isosceles</p>
<p>(d) obtuse-angled and isosceles</p>
Step-by-Step Solution
Key Concept: Find the vertices of the triangle by solving the three lines simultaneously, then check the side lengths and angles.
<p>Not provided in source text</p>
Correct Answer: c