<B=120⁰-90⁰=30⁰
AC=AB/2=2AC
AC+2AC=21
3AC=21
AC=21:3=7
AB=2•7=14cm
AC=7cm; AB=14cm
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<B=120⁰-90⁰=30⁰
AC=AB/2=2AC
AC+2AC=21
3AC=21
AC=21:3=7
AB=2•7=14cm
AC=7cm; AB=14cm