how to draw an arc line on google map?

MapExtensions.kt

import com.google.android.gms.maps.GoogleMap
import com.google.android.gms.maps.model.LatLng
import com.google.android.gms.maps.model.Polyline
import com.google.android.gms.maps.model.PolylineOptions
import com.google.maps.android.SphericalUtil

val optionsForeground: PolylineOptions? = null

fun showCurvedPolyline(
    googleMap: GoogleMap,
    startPoint: LatLng,
    endPoint: LatLng,
    k: Double,
    routeColor: Int
): Polyline? {
    //Calculate distance and heading between two points
    val d = SphericalUtil.computeDistanceBetween(startPoint, endPoint)
    val h = SphericalUtil.computeHeading(startPoint, endPoint)

    //Midpoint position
    val p: LatLng = SphericalUtil.computeOffset(startPoint, d * 0.5, h)

    //Apply some mathematics to calculate position of the circle center
    val x = (1 - k * k) * d * 0.5 / (2 * k)
    val r = (1 + k * k) * d * 0.5 / (2 * k)
    val c: LatLng = SphericalUtil.computeOffset(p, x, h + 90.0)

    //Polyline options
    val options = PolylineOptions()
//    val pattern: List<PatternItem> = arrayListOf(Dash(30f), Gap(20f))

    //Calculate heading between circle center and two points
    val h1 = SphericalUtil.computeHeading(c, startPoint)
    val h2 = SphericalUtil.computeHeading(c, endPoint)

    //Calculate positions of points on circle border and add them to polyline options
    val numpoints = 100
    val step = (h2 - h1) / numpoints
    for (i in 0 until numpoints) {
        val pi: LatLng = SphericalUtil.computeOffset(c, r, h1 + i * step)
        options.add(pi)
    }

    //Draw polyline
    return googleMap.addPolyline(options.width(10f).color(routeColor).geodesic(false))
}

fun showNormalPolyline(
    googleMap: GoogleMap,
    startPoint: LatLng,
    endPoint: LatLng,
    routeColor: Int
): Polyline? {
    val options = PolylineOptions()
    options.add(startPoint)
    options.add(endPoint)
    return googleMap.addPolyline(options.width(10f).color(routeColor).geodesic(false))
}