Android Canvas - drawing an equilateral triangle

TriangleView.kt

class TriangleView(context: Context?, attrs: AttributeSet?) : View(context, attrs) {

    val paint = Paint()
    val path = Path()

    override fun onDraw(canvas: Canvas?) {
        super.onDraw(canvas)
        canvas ?: return
        canvas.drawPath(configurePath(canvas.width.toFloat(), path), configurePaint(paint))
    }

    fun getHeight(width: Double): Float {
        return Math.sqrt((Math.pow(width, 2.0) - Math.pow((width / 2), 2.0))).toFloat()
    }

    fun configurePaint(paint: Paint): Paint {
        paint.color = android.graphics.Color.WHITE
        paint.isAntiAlias = true

        return paint
    }

    fun configurePath(sideLength: Float, path: Path): Path {
//        pointing up
        path.moveTo(0f, sideLength)
        path.lineTo(sideLength / 2f, sideLength - getHeight(sideLength.toDouble()))
        path.lineTo(sideLength, sideLength)
        
//        pointing down
//        path.lineTo((sideLength / 2f), getHeight(sideLength.toDouble()))
//        path.lineTo(sideLength, 0f)
//        path.lineTo(0f, 0f)

//        pointing right
//        path.lineTo(0f, 0f)
//        path.lineTo(0f, sideLength)
//        path.lineTo(getHeight(sideLength.toDouble()), (sideLength / 2f))

//        pointing left
//        path.moveTo(sideLength, 0f)
//        path.lineTo(sideLength, sideLength)
//        path.lineTo(sideLength - getHeight(sideLength.toDouble()), sideLength / 2f)
        return path
    }
}