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a) P = 6 × (5cm)²
Pp = 6 × 25cm²
Pp = 150cm²
b) P = 6 x (8dm)²
P = 6 × 64dm²
P = 384dm²
c) P = 6 × (10m)²
P = 6 × 100m²
P = 600m²
Ad.2.
a) Pc = 2(4cm × 3cm) + 4(3cm × 6cm) = 2 × 12cm² + 4 × 18cm² = 24cm² + 72cm² = 96cm²
b) Pc = 2(7dm × 7dm) + 4(7dm × 5dm) = 2 × 49dm² + 4 × 35dm² = 98dm² + 140dm² = 238dm²
c) Pc = 2(12cm × 3cm) + 4(3cm × 9cm) = 2 × 36cm² + 4 × 27cm² = 72cm² + 108cm² = 180cm²
d) Pc = 2(4m × 2m) + 4(2m × 8m) = 2 × 8m² + 4 × 16m² = 16m² + 64m² = 80m²
Ad.3.
Pp = 486cm²
486cm² = 6a² /:6
81cm² = a²/√
a = √81cm²
a = 9cm
Ad.4.
Pc = 2(2 x 3) + 4(3 x 66) = 2 x 6 + 4 x 198 = 12 + 792 = 804
Ad.5.
4 x 4 + 4 x 2 + 4 x 1 = 16 + 8 + 4 = 28
a) P= 6a²
P=6×5²
P=6×25
P=150cm²
b) P=6×80²
P= 6×6400
P=38400cm²
c) P=6×100²
P=6×1000
P=6000cm²
2.
a) P=2ab+2bc+2ac
P=2×4×3+2×3×6+2×4×6
P=11280cm²
b) P=2×70×70+2×70×50+2×70×50
P=86800cm²
c)P=2×12×3+2×3×9+2×12×9
P=342cm×
d)P=2×400×20+2×20×80+2×400×80
P=83200cm²