Предмет: Геометрия, автор: bri7

Помогите решить.......​

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Ответы

Автор ответа: ludmilaksenija2005
0

Объяснение:

1)

AD=BC=8

S=AD•BK=8•4=32

2)

BC=AD=10

S=AB•BC•sinB=6•10•sin150=60•1/2=30

3)

∠A=180-∠B-∠C=180-100-50=30

S=(AB•AC•sinA)/2=(8•14•sin30)/2=

=(8•14•1/2)/2=28

4)

по теореме Пифагора:

АВ=√(ВС²-АС²)=√(13²-5²)=√144=12

S=1/2•AC•AB=1/2•5•12=30

5)

S=(AC•BD)/2=(12•16)/2=96

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