You can trim sketch entities, including infinite lines, and extend sketch entities (lines, centerlines, and arcs) to meet other entities.
Trim Entities 
includes options:
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Power trim |
Trim multiple adjacent sketch entities by dragging the pointer across the entities, or extend entities by selecting them and dragging the pointer. |
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Corner |
Trim or extend two sketch entities until they intersect at a virtual corner. |
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Trim away inside |
Trim open sketch entities inside two bounding entities. |
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Trim away outside |
Trim open sketch entities outside two bounding entities. |
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Trim to closest |
Trim or extend sketch entities to the closest intersection. |