As shown in the figure, given that point C is the midpoint of line AB, point D is the midpoint of BC, ab = 10cm, find the length of AD

∵ C point is the midpoint of AB, D point is the midpoint of BC, ab = 10cm, ∵ AC = CB = 12ab = 5cm, CD = 12bc = 2.5cm, ∵ ad = AC + CD = 5 + 2.5 = 7.5cm

C. D is two points on the line AB, C is the midpoint of AD, ab = 10cm, AC = 4cm, find the length of DB

∵ C is the midpoint of AD, AC = 4cm, ∵ ad = 8, ∵ AB = 10cm, ∵ BD = ab-ad = 2cm

As shown in the figure a-c-d-b; D is the midpoint of the line CB, ad = 8cm, ab = 10cm, find the length of CB

Analysis
Known ad = 8
AB=10
So DB = 2
D is the midpoint of BC
therefore
CD=DB=2
therefore
CB=2X2=4

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