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=p×l + l.tab+l.tdc+l.tad+l.tbc
=12×30 + ½. a.t+ ½. a.t+ ½. a. t+ ½. a.t
=360+½.12.7+½.12.7+½.30.13+½.30.13
=360+42+42+195+195
=834 cm
834 cm