In Sun-Earth system, the Sun, the Earth and the Lagrange point L4 form:

  1. A. an isosceles triangle
  2. B. an equilateral triangle
  3. C. a straight line
  4. D. a scalene triangle

Correct Answer: B. an equilateral triangle

Explanation

The Lagrange points L4 and L5 are located at the corners of two equilateral triangles whose common base is the line between the two large masses (Sun and Earth)[cite: 1].

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