Choose all the fractions that are in simplest form. 4/26 8/21 6/19 9/10 10/22
1 answer:
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Answer:
Area of ring = 462 cm²
Perimeter of ring = 44 cm
Step-by-step explanation:
Given,
radius of inner ring = 7 cm
radius of outer ring = 14 cm
To find,
Area and perimeter of ring
Formula:
Area of circle = π Radius²
Perimeter of circle = 2π Radius
Area of inner ring = π Radius²
⇒ ×
⇒ 22 × 7
⇒ 154 cm²
Area of outer ring = π Radius²
⇒ ×
⇒ 22 × 14 × 2
⇒ 616 cm²
∴ Area of ring = 616 - 154 = 462 cm²
Perimeter of inner ring = 2π Radius
⇒ 2 × × 7
⇒ 44 cm
Perimeter of outer ring = 2π Radius
⇒ 2 × × 14
⇒ 88 cm
∴ Perimeter of ring = 88 - 44 = 44 cm