Respuesta :

lambuhere

Answer:

total surface area = area of the two equilateral triangles + area of the 3 rectangles,

= 2(√3/4 a²) + 3( l x b )

= 2[√3/4 (3)²] + 3( 5 x 3 )

= 2 x 3.9 + 45

= 7.8 + 45

= 52.8 m²

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