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panjang sisi tegak = √10² - 6²
= √100-36
= √64
= 8 cm
keliling = 8 + 5 + 10 + 11
= 34 cm
K = DC + AB + BC + √BC² - (AB-DC)²
K = 5 + 11 + 10 + √10 - (11-5)²
K = 26 + √10²-6²
K = 26 + √100-36
K = 26 + √64
K = 26 + 8
K = 34 ===>B