1б) 2x+x+90=180
3x=90
x=30°
а=12÷2=6
2б) AB=18 , BD = ?
<C=180°-(90°+60°)=30°
AC= 18÷2=9
AD=9÷2=4,5
BD=18-4,5=13,5.
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1б) 2x+x+90=180
3x=90
x=30°
а=12÷2=6
2б) AB=18 , BD = ?
<C=180°-(90°+60°)=30°
AC= 18÷2=9
AD=9÷2=4,5
BD=18-4,5=13,5.