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Kewaye da wani trapezoid, kewaye dabara kalkuleta

Kewaye da wani trapezoid, kewaye dabara kalkuleta ba ka damar samun kewaye a trapezoid, da dabara, ta yin amfani da tsawon dukan trapezoid tarnaƙi.
a:   b:   c:   d:  

Kewaye da wani trapezoid

Trapezoid ne mai convex quadrilateral da a kalla daya biyu daga layi daya tarnaƙi, da ake kira da kwasfa na trapezoid, da kuma sauran bangarorin biyu, an kira da kafafu ko a kaikaice tarnaƙi.
Formula for kewaye a alwatika: P=a+b+c+d,
inda a, b, c, d - tarnaƙi a trapezoid