Ответ:
10 см
Объяснение:
[tex]\angle A+\angle B=90^{\circ};[/tex]
[tex]2\angle B+\angle B=90^{\circ};[/tex]
[tex]3\angle B=90^{\circ};[/tex]
[tex]\angle B=30^{\circ};[/tex]
[tex]\angle B=30^{\circ} \Rightarrow CD=\dfrac{1}{2}BC;[/tex]
[tex]BC+CD=15 \Rightarrow BC+\dfrac{1}{2}BC=15; \quad 1,5 \cdot BC=15; \quad BC=10 \ (cm);[/tex]
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Verified answer
Ответ:
10 см
Объяснение:
[tex]\angle A+\angle B=90^{\circ};[/tex]
[tex]2\angle B+\angle B=90^{\circ};[/tex]
[tex]3\angle B=90^{\circ};[/tex]
[tex]\angle B=30^{\circ};[/tex]
[tex]\angle B=30^{\circ} \Rightarrow CD=\dfrac{1}{2}BC;[/tex]
[tex]BC+CD=15 \Rightarrow BC+\dfrac{1}{2}BC=15; \quad 1,5 \cdot BC=15; \quad BC=10 \ (cm);[/tex]