Concept:The logical order of sentences in a paragraph should flow from general introduction to specific details about triangles.
Explanation:Start with sentence 1: "A triangle has three sides."
Q comes next because it introduces triangle as a basic shape: "It is one of the basic shapes."
R follows naturally, stating that every triangle has three angles: "Every triangle has three angles."
P then explains that the angles can be equal or different: "The angles can be equal or different."
S ends this part with the property that the sum of angles is always 180 degrees: "The sum of angles is always 180 degrees."
Finally, sentence 6 concludes: "Triangles are important in geometry."
Thus the correct sequence is QRPS.
Answer:Option D (QRPS)