So lets ABCD are the sides of the square and AB=CD, AC=BD and the Angle ABC = 90 so therefore by making a diagonal we can use the SAS or SSS congruency for two triangles, so we can prove two triangles are equal and that is why the shape is square.
Answer:
(I think its C sorry if i get you wrong)
(Hope this helps)
Since 10 cm is bigger than 1 mm, the scale drawing is bigger
Answer:
50cm
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