L = ½ × (AB + CD) × CE
21 = ½ × (AB + 6) × 3
(21 × 2)/3 = AB + 6
14 = AB + 6
AB = 14 - 6
AB = 8 cm
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L = ½ × (AB + CD) × CE
21 = ½ × (AB + 6) × 3
(21 × 2)/3 = AB + 6
14 = AB + 6
AB = 14 - 6
AB = 8 cm