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ans is 504m²

Step-by-step explanation:

given = side of square=18m

height of triangle=12m

formula= surface area of square + surface area of 4 triangles

surface area of square = 4 × length

= 4×18

=72m²

surface area of triangle = 1/2×base ×height

= 1/2×18×12 ( the base lies on the side of the squre so the base is also 18m)

= 108m²

therefore, surface area of 4 triangles = 4×108=432m²

therefore the surface area of the given figure= surface area of aquare + surface area of the 4 triangles

surface area of square= 72 +432

=504m²

14.3

step-by-step explanation:

add all the numbers together.

9 + 12 + 15 + 16 + 17 + 17 = 86

now, divide 86 by how many numbers we have: 6.

86 / 6 = 14.3