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1/2d1 = 1/2.18 = 9
1/2d2 = 1/2.24 = 12
√9²+12²
(=) √81 + 144
(=) √225
(=) 15
keliling = 4s
(=) 4(15)
(=) 60 cm
d2 = 24:2 = 12
pake phytagoras untuk mencari sisinya
sisi = √9²+12²
= √81+144
= √225
= 15
sisi belah ketupat = 15cm
kelilingnya = 15+15+15+15 = 60cm² (C)