Trên tập hợp số nguyên Z, xét quan hệ hai ngôi S như sau: aSb  a  b chia hết cho 7, với mọi a, b  Z. Chứng minh S là một quan hệ tương đương.

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The figure shows triangle def and line segment bc, which is parallel to ef: triangle def has a point b on side de and point c on side df. the line bc is parallel to the line ef. part a: is triangle def similar to triangle dbc? explain using what you know about triangle similarity. part b: which line segment on triangle dbc corresponds to line segment ef? explain your answer. part c: which angle on triangle dbc corresponds to angle f? explain your answer. asap

Find the circumference of a pizza with a diameter of 10 inches round to the nearest tenth