1. Name one set of three coplanar lines. 2. Name a second set of three coplanar lines. 3. Name two pairs of skew lines. 4. Name two pairs of intersecting lines.

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A: Since the product of slopes is -1 hence these lines are perpendicular.

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A: To write: Three parallel lines be coplanar or not and to draw the diagram.

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A: Here P is the intersection point of median which is known as Centroid  of the triangle ,

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