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= 3 × 6 ÷2
= 18 cm
7) . Lgab = L ½ lingkaran + L ∆
= ( ½ ×π × jari - jari × jari - jari ) + ( a× t ÷ 2 )
= (½× 22/7 × 7× 7)+( 14× 4 ÷ 2)
= 77 + 28 = 105 dm
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