It’s urgent help me I have maths today plz help me!!

Step-by-step explanation:

Vertices of the given triangle ABC are A(-1, 4), B(-1, 1) and C(-3, 1)

Equation of the mirror line → y = x

Rule to reflect these vertices over the mirror line y = x,

(x, y) → (y, x)

Therefore, image points of the vertices will be,

A(-1, 4) → A'(4, -1)

B(-1, 1) → B'(1, -1)

C(-3, 1) → C'(1, -3)

Now we can plot these image points to get the image triangle A'B'C'.

3775.2mm squared

Step-by-step explanation

You find the area of each side and add all of them together. You divide by 2 for every triangle, and the slant height is never used.