Jawaban:
9. Area = 1.256 cm²
Perimeter = 125,6 cm
10. Area = 1.039,5 cm²
Perimeter = 99 cm
Penjelasan dengan langkah-langkah:
9. Area = phi × radius × radius
= π × r × r
= 3,14 × 20 × 20
= 1.256 cm²
Perimeter = phi × diameter
= π × d
= 3,14 × 40
= 125,6 cm
10. Area = ¾ × (phi × radius × radius)
= ¾ x (π × r × r)
= ¾ × (22 × 21 × 21)
7
= ¾ × 1.386
= 1.039,5 cm²
Perimeter = ¾ × (phi × diameter)
= ¾ × (π × d)
= ¾ × (22 × 42)
7
= ¾ × 132
= 99 cm
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