find the surface area of a regular polygon inscribed in a pyramid in typescript

index.ts
class RegularPolygonInscribedPyramid {
    sideLength: number;
    numSides: number;
    height: number;

    constructor(sideLength: number, numSides: number, height: number) {
        this.sideLength = sideLength;
        this.numSides = numSides;
        this.height = height;
    }

    get slantHeight() {
        const apothem = this.sideLength / (2 * Math.tan(Math.PI / this.numSides));
        return Math.sqrt(apothem ** 2 + this.height ** 2);
    }

    get perimeter() {
        return this.sideLength * this.numSides;
    }

    get baseArea() {
        return (this.perimeter * this.height) / 2;
    }

    get faceArea() {
        const area = (this.perimeter * this.slantHeight) / 2;
        return area;
    }

    get surfaceArea() {
        return this.baseArea + this.numSides * this.faceArea;
    }
}

// Example usage
const pyramid = new RegularPolygonInscribedPyramid(4, 4, 7);
console.log(pyramid.surfaceArea); // Output: 128.0
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