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Your solution is almost there! Just need to work out the area
of the 3 triangles in blue.

They are:
    1/2 x 12 x 12 = 72
    1/2 x  6 x 18 = 54
    1/2 x 30 x 18 = 270

So answer is (12 x 12) + (18 x 18) - 72 - 54 - 270 = 72 cm2.

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0 Replies 2 Likes ✔Accepted Answer