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given:AP=15cm,CR=19cm, AP||QB||RC
in triangle PAC,
xb=AP/2. (mid point theorem)
xb=15/2
xb=7.5
in triangle PRC,
xq=CR/2. (mid point theorem)
xq=19/2
xq=9.5
QB=xb+xq
QB=7.5+9.5
QB=17cm
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