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√[(19-7)/2]² + 8²
√6² + 8²
√36 + 64
√100
= 10 cm
maka keliling
2 sisi miring + sisi sejajar atas + sisi sejajar bawah
2(10) + 7 + 19
20 + 7 + 19
46 cm
keliling = 7 + 19 + 10 + 10 = 46 cm