# How do I create a surface from 4 lines (rectangle)

**URL:** <https://discourse.shapr3d.com/t/how-do-i-create-a-surface-from-4-lines-rectangle/1500>\
**Category:** Modeling Questions\
**Created:** [September 11, 2017, 3:36am UTC](https://discourse.shapr3d.com/t/how-do-i-create-a-surface-from-4-lines-rectangle/1500 "2017-09-11T03:36:17Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ADLADLADL](https://avatars.discourse-cdn.com/v4/letter/a/e0b2c6/32.png) [@ADLADLADL](https://discourse.shapr3d.com/u/ADLADLADL)\
**Post date:** [September 11, 2017, 3:36am UTC](https://discourse.shapr3d.com/t/how-do-i-create-a-surface-from-4-lines-rectangle/1500/1 "2017-09-11T03:36:17Z")

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I have extruded a rectangle, but now the structure is open on 2 sides. How do I create a surface?

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**Author:** ![DanielR](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/danielr/32/582_2.png) [@DanielR](https://discourse.shapr3d.com/u/DanielR)\
**Post date:** [September 11, 2017, 12:15pm UTC](https://discourse.shapr3d.com/t/how-do-i-create-a-surface-from-4-lines-rectangle/1500/2 "2017-09-11T12:15:19Z")

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Hi,

Have you extruded the whole profile (by tapping on the sketch filling) or just the lines?

Make sure you extrude the sketch filling and then you shouldn’t get the mentioned results.