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2014-05-04T21:19:47+07:00
RQ = 1/5.22/7.2.14 = 17,6 cm
SP = 1/5.22/7.2.7 = 8,8 cm
RQ+PQ+SP+SR = 17,6 + 7 + 8,8 + 7 = 40,4 cm