题目如图,在Rt△ABCRt\triangle ABCRt△ABC中,∠B=90∘\angle B=90^{\circ}∠B=90∘,ADADAD平分∠BAC\angle BAC∠BAC,交BCBCBC于点DDD,BD=2BD=2BD=2,AC=7AC=7AC=7,AB=6AB=6AB=6,则S△ABC=______.S_{\triangle ABC}=\_\_\_\_\_\_.S△ABC=______.知识点：相似三角形的判定I章节：图形的变化 / 图形的相似
如图,在中,,平分,交于点,,,,则如图,在中,,平分,交于点,,,,则如图,在中,,平分,交于点,,,,则