In the triangle ABC below, the four small triangles a, B, C and d have the same area. AB is 3.6cm long, DB is______ Cm

According to a certain height, the area is directly proportional to the bottom: s △ ACD: s △ CDB = (area of a + area of B + area of C): area of D = 3:1, so ad: DB = 3:1, ab = 3.6, DB = 3.6 △ (3 + 1) = 0.9, so the answer is: 0.9

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