Ответ:
R=175√66/264 ед
Объяснение:
S=√(p(p-RE)(p-EF)(p-RF));
p=(RE+EF+RF)/2=(10+5+7)/2=
=22/2=11 ед
S=√(11(11-10)(11-5)(11-7))=
=√(11*1*6*4)=2√66 ед²
RO=(RE*EF*RF)/4S=(10*5*7)/4*2√66=
=350/8√66=175/4√66=175√66/264
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Ответ:
R=175√66/264 ед
Объяснение:
S=√(p(p-RE)(p-EF)(p-RF));
p=(RE+EF+RF)/2=(10+5+7)/2=
=22/2=11 ед
S=√(11(11-10)(11-5)(11-7))=
=√(11*1*6*4)=2√66 ед²
RO=(RE*EF*RF)/4S=(10*5*7)/4*2√66=
=350/8√66=175/4√66=175√66/264