# How to draw an arc in my mesh

**URL:** <https://community.freefem.org/t/how-to-draw-an-arc-in-my-mesh/3093>\
**Category:** General Discussion\
**Created:** [April 9, 2024, 2:03pm UTC](https://community.freefem.org/t/how-to-draw-an-arc-in-my-mesh/3093 "2024-04-09T14:03:57Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![zoumpou](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/zoumpou/32/2214_2.png) [@zoumpou](https://community.freefem.org/u/zoumpou)\
**Post date:** [April 9, 2024, 2:03pm UTC](https://community.freefem.org/t/how-to-draw-an-arc-in-my-mesh/3093/1 "2024-04-09T14:03:57Z")

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// Mesh  
border a(t=0, 1) {x=t; y=0;, z=0; label=1;};

border b(t=0, 2) {x=1; y=t;, z= label=1;};

border c(t=1, 3) {x=t; y=2; label=1;};

border d(t=0, 2) {x=3; y=2-t; label=1;};

border e(t=0, 1) {x=3+t; y=0; label=1;};

border f(t=0, 1) {x=4; y=3\*t; label=1;};

border g(t=1, 0) {x=4\*t; y=3; label=1;};

border h(t=1, 0) {x=0; y=3\*t; label=1;};

mesh th = buildmesh(a(10) + b(15) + c(20) + d(15) + e(10) + f(20) + g(30) + h(20));

in my geometry i want to have an arc between the borders a and e instead of b,c and,d what should i do?

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**Author:** ![frederichecht](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/frederichecht/32/15_2.png) [@frederichecht](https://community.freefem.org/u/frederichecht)\
**Post date:** [April 10, 2024, 8:47am UTC](https://community.freefem.org/t/how-to-draw-an-arc-in-my-mesh/3093/2 "2024-04-10T08:47:06Z")

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you need to have a parametrization of you arc and you defined you border with this parametrisation.