var Jsonmap = L.map("jsonmap").setView([38.891, 139.824], 16);
L.tileLayer(
    '//{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
    {attribution:
     '&copy; <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
    }).addTo(Jsonmap);
var gj = L.geoJson(triangle, {
    style: function (feature) {
	return feature.properties;
    }
});
L.control.layers(null, {"Triangle": gj}).addTo(Jsonmap);