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natali 33 [55]
3 years ago
10

HELP ME PLEASE I NEED THIS and tell me how to solve for it

Mathematics
2 answers:
olasank [31]3 years ago
8 0
616.6 cm square is the answer
Vinil7 [7]3 years ago
6 0

Answer:

616.6 square cm

Step-by-step explanation:

Area of a regular octagon

= 2 {a}^{2} (1 +  \sqrt{2} ) \\  = 2 \times  {12}^{2} (1 + 1.414) \\  = 2 \times 144 \times 2.141 \\  = 288 \times 2.141 \\  = 616.608 \\  = 616.6 \:  {cm}^{2}

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