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158.4 in^2

Step-by-step explanation:

eight of those triangles can fit into one octagon

the area of the triangle is 19.8 in^2

if you multiply that by eight (since eight triangles can fit in the octagon) you will get 158.4

so 158.4 in^2 is the area of the octagon.

Octagon ; 158.4 in²

Step-by-step explanation:

8(½×6×6.6) = 158.4

answer: 1 and 3

step-by-step explanation: