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= 1/2 × ( 8cm + 15cm ) × ( 8cm + 8cm )
= 1/2 × 23cm × 16cm
= 23cm × 8cm
= 184cm²
Maaf kalau salah dan semoga bermanfaat
diaginal 2: 8+8=16
21x16 x1/2 = 21.8 = 168