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layang", L= d1 x d2 : 2. K= 4s
lingkaran, L=2 r kuadrat. K= r
trapesium = a+b : 2
Keliling belah ketupat = 4 × sisi
Luas layang-layang =
Keliling layang-layang = 2(sisi 1 + sisi 2)
Luas Lingkaran = π · r²
Keliling Lingkaran = π · d
Luas Trapesium sama kaki =
Keliling trapesium sama kaki = atas + bawah + (2 × sisi miring)
Luas Trapesium siku-siku =
Keliling Trapesium siku-siku = atas + bawah + tinggi + sisi miring