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そこまでで来てるなら、周りの3つの三角形はすべて直角三角形なので、
長方形6×4=24から
2×6÷2=6
4×3÷2=6
2×3÷2=3
の3つの三角形を引けばいいですよ。
24-(6+6+3)=9

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