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189 yd²

Step-by-step explanation:

so in a prism, there are total 5 surfaces;

3 rectangular(all of same size)

2 triangular (of same sizes too)

so the area of trangle = 1/2× base × height = 1/2 × 6× 4 = 12yd²

for two triangles, Area= 24 yd²

area of a rectangle= length× breadth = 11× 5 = 55yd²

for three rectangles, area= 165yd²

now you add them

total surface area = 24+ 165= 189yd²