D AND E ARE POINTS INSIDE AN EQUILATERAL TRIANGLE ABC SUCH THAT D...

9. - ĐỀ THI OLYMPIC TOÁN TMO VÒNG CÁ NHÂN
Toán ĐỀ THI OLYMPIC TOÁN TMO VÒNG CÁ NHÂN
9. D and E are points inside an equilateral triangle ABC such that D is closer to AB than to AC. If AD=DB=AE =EC =7cm and DE =2cm, what is the length of BC, in cm? A D E B C Answer : cm