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=2. a.t/2 + (p.l+p.l+p.l)
=2. 12 x 8/2 + (12x15 +15x10 +15x10)
=96+480
=576
= (2×)cm² + (32 × 15) cm²
= 96 cm² + 480 cm²
= 576 cm²