Answer:
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
