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kell=4.5 = 20 (A)
4. L= a.t
84 = 14.t
6 =t
(B)
1/2 diagonal 2 = 4
mencari sisi miring dengan pytagoras r = √3²+4² = √25 = 5
dikalikan 4 karena ada 4 bidang miring, jadi keliling ketupat = 5 × 4 = 20