Trapezoid yi Ikwadrilatherali eneepoligoni ubuncinane esinye isibini kumacala ngaxeshanye, ngokuba neziseko trapezoid, kunye namanye amacala amabini ngokuba imilenze okanye amacala akude. Formula for odonga kanxantathu: P=a+b+c+d, apho, b, c, d - emacaleni trapezoid
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