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= ( ½ × ( a + b ) × t ) - ( ½ × π × r × r )
= ( ½ × ( 30 + 14 ) × 7 ) - ( ½ × 22/7 × 7 × 7 )
= ( ½ × 44 × 7 ) - ( 11 × 7 )
= ( 22 × 7 ) - 77
= 154 - 77
= 77 cm²
5 ) Selisih = L diarsir - L tidak diarsir
= 77 - 77
= 0 cm
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