diff --git a/src/geom/mod.rs b/src/geom/mod.rs
index a40d6da..175aad2 100755
--- a/src/geom/mod.rs
+++ b/src/geom/mod.rs
@@ -11,7 +11,7 @@ pub fn det3x3t(a: &[f64], b: &[f64], c: &[f64]) -> f64 {
     ((a[0] - c[0]) * (b[1] - c[1])) - ((a[1] - c[1]) * (b[0] - c[0]))
 }
 
-pub fn area_triangle(a: &[f64], b: &[f64], c: &[f64]) -> f64 {
+pub fn area2d_triangle(a: &[f64], b: &[f64], c: &[f64]) -> f64 {
     det3x3t(a, b, c) / 2.0
 }
 
diff --git a/src/interpolation/mod.rs b/src/interpolation/mod.rs
index 014f8ed..b748cdd 100755
--- a/src/interpolation/mod.rs
+++ b/src/interpolation/mod.rs
@@ -190,11 +190,11 @@ impl Interpolant for TIN {
                 Ok(tr) => {
                     let q: [f64; 3] = [p[0], p[1], 0.0];
                     let a0: f64 =
-                        geom::area_triangle(&q, &dt.stars[tr.v[1]].pt, &dt.stars[tr.v[2]].pt);
+                        geom::area2d_triangle(&q, &dt.stars[tr.v[1]].pt, &dt.stars[tr.v[2]].pt);
                     let a1: f64 =
-                        geom::area_triangle(&q, &dt.stars[tr.v[2]].pt, &dt.stars[tr.v[0]].pt);
+                        geom::area2d_triangle(&q, &dt.stars[tr.v[2]].pt, &dt.stars[tr.v[0]].pt);
                     let a2: f64 =
-                        geom::area_triangle(&q, &dt.stars[tr.v[0]].pt, &dt.stars[tr.v[1]].pt);
+                        geom::area2d_triangle(&q, &dt.stars[tr.v[0]].pt, &dt.stars[tr.v[1]].pt);
                     let mut total = 0.;
                     total += dt.stars[tr.v[0]].pt[2] * a0;
                     total += dt.stars[tr.v[1]].pt[2] * a1;
diff --git a/src/lib.rs b/src/lib.rs
index 5a5258e..ba62c27 100755
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1793,7 +1793,7 @@ impl Triangulation {
         centres.push(vec![centres[0][0], centres[0][1]]);
         let mut totalarea = 0.0_f64;
         for c in centres.windows(2) {
-            totalarea += geom::area_triangle(&self.stars[vi].pt, &c[0], &c[1]);
+            totalarea += geom::area2d_triangle(&self.stars[vi].pt, &c[0], &c[1]);
         }
         Some(totalarea)
     }