Предмет: Геометрия, автор: moon6123

очень надо(40 баллов)​

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Автор ответа: Аноним
0

Ответ:

24см

Объяснение:

∆BFG~∆ABC, по первому признаку.

ВF/BA=BG/BC

Пусть BG будет х, ВС будет (х+12)

6/14=х/(х+12)

14х=6(х+12)

14х=6х+72

14х-6х=72

8х=72

х=72/8

х=9 см сторона BF;

BF/BA=FG/AC

6/14=FG/21

FG=6*21/14=9 см

Р∆FBG=FB+BG+FG=6+9+9=24см

moon6123: спасибо огромное!)
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