created service to calculate distance between two coordinates

src/app/service/calculateDistance.service.ts

@@ -0,0 +1,25 @@
+import {Injectable} from '@angular/core';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class CalculateDistanceService{
+  getDistanceBetweenCoordinates(lat1: number, lon1: number, lat2: number, lon2: number) {
+    const earthRadius = 6371; // Radius of the earth in km
+    const dLat = this.deg2rad(lat2 - lat1);  // deg2rad below
+    const dLon = this.deg2rad(lon2 - lon1);
+    const a =
+      Math.sin(dLat / 2) * Math.sin(dLat / 2) +
+      Math.cos(this.deg2rad(lat1)) * Math.cos(this.deg2rad(lat2)) *
+      Math.sin(dLon / 2) * Math.sin(dLon / 2)
+    ;
+    const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
+    // Distance in km
+    return earthRadius * c;
+  }
+
+  deg2rad(deg: number) {
+    return deg * (Math.PI / 180)
+  }
+
+}