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= 28 dm + 42 dm : 2 × 14 dm
= 70 dm : 2 × 14 dm
= 35 dm × 14 dm
= 490 dm2 (dm persegi )
Lsetengah lingkaran = phi × r × r : 2
= 22per7 × 14 dm × 14 dm : 2
= 308 dm2 (dm persegi )
Lyang diarsir = Ltrapesium - Lsetengah lingkaran
= 490 dm2 - 308 dm2
= 182 dm2 (d)