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Please help me with this step by step

Please help me with this step by step-example-1
User Kerox
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these two triangles are joined up with one line; they have similarities. their similarity is having the bottom line of the triangle (100ft and 500ft). the scale factor of these two number is 5. the side AB is the same as DE x sf(5) which is 2000ft
User Juminoz
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