Answer asap! : ) what is the slant height if the surface area is 243 square centimeters? 8 cm 10 cm 11 cm 9 cm

Option D. 9 cm

Step-by-step explanation:

Surface area of the given figure is S = 243 cm² and we have to find the slant height.

We can see this figure comprises of 1 square and 4 triangles.

Let the slant height of the given triangles is L.

So area of one triangle =

and the area of square = side² = 9² = 81 cm²

Now surface area of total figure = Area of square + 4×(area of a triangle)

243 = 81 + 2×9L

18L = 243 - 81 = 162

L = 9 cm

Therefore Option D. 9 cm is the correct answer.

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step-by-step explanation: