Harry's cloak
Harry Potter has a triangular cloak with a triangular Gryffindor badge on it. The Gryffindor badge takes up some of the area on the cloak. the triangular cloak's base is 10 cm, and the height is 70 mm. The badge's base is 3 cm, and the height is 4 cm. what is the area of the cloak without the badge? (in cm)
The answer is 29.
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