// Define the id of your board in BOARDID
const board = JXG.JSXGraph.initBoard(BOARDID, {
boundingbox: [-2, 2, 2, -2],
keepaspectratio: true
});
var A = board.create('point', [-1, -1]),
B = board.create('point', [1, -1]),
C = board.create('point', [0, 1]),
alpha = board.create('angle', [B, A, C], {
type: 'sector',
orthoType: 'square',
orthoSensitivity: 2,
radius: 0.5
}),
beta = board.create('angle', [C, B, A], {
type: 'sector',
orthoType: 'sectordot',
orthoSensitivity: 2,
radius: 0.2
});