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Alik [6]
3 years ago
11

(please explain clearly, I am very tired) Find the surface area of the composite figure.

Mathematics
1 answer:
Y_Kistochka [10]3 years ago
8 0

Answer:

644

Step-by-step explanation:

SA=[2×(5×20 + 5×6 + 20×6)] +

[2×(4×12 + 4×6 + 12×6)] -

[ 2× 12×6]

= [2×(250)]+[2×(144)] - [144]

= 500+288-144

= 644 cm²

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