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"\\( \\begin{array} { c c c c } { 10 \\mathrm { cm } } & { \\mathrm { B } } & { } & { } \\\\ { } & { } & { 8 . } & { \\mathrm { ABCD } \\text { and } \\mathrm { EFGH } \\text { are square } \\mathrm { f } } \\\\ { \\mathrm { D } } & { } & { } & { \\text { calculate: } } \\\\ { } & { } & { } & { \\text { a) } \\text { the length } \\mathrm { DB } } \\\\ { } & { } & { } & { \\text { b } } & { \\text { the length } \\mathrm { HF } } \\\\ { } & { F } & { ( 8 \\mathrm { cm } } & { \\text { c) } } & { \\text { the vertical height of the ob } } \\\\ { } & { 6 \\mathrm { cm } } & { } & { } \\end{array} \\)"

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