Ответ:
D=30
R=D:2=30:2=15
R=15
S=П×R²=3.14×15²=706.5
15×20|2=150
25+15+20=60
R=150:60=2.5
S=150
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Ответ:
D=30
R=D:2=30:2=15
R=15
S=П×R²=3.14×15²=706.5
15×20|2=150
25+15+20=60
R=150:60=2.5
S=150