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Given the line segment AB, extend the line segment AB to C to make BC = 1 / 2Ab, extend the line segment Ba to D to make ad = AB, take the midpoint h of DC, if BC = 5cm, find the length of ah fifty-five billion five hundred and fifty-five million five hundred and fifty-five thousand five hundred and fifty-five
D——A——H——B——C
∵BC＝1/2AB,BC＝5
∴1/2AB＝5
∴AB＝10
∵AD＝AB
∴AD＝10
∴DC＝AD+AB+BC＝10+10+5＝25
∵ h is the midpoint of DC
∴DH＝DC/2＝25/2
∴AH＝DH-AD＝25/2-10＝5/2
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