Answer:
Explanation:
Calculate Circumference = 2π·r and Area = π·r²
1. Given : diameter = 221 mm
d=2·r so because the diameter is twice as big as the radius r = 221/2
Circumference = 2π·r = 2·π·221/2 = 221π ≈ 694.3 mm
Area = π·r² = π·(221/2)² = π·(221²/2²) ≈38,359.6 mm²
2. Given: radius = 2cm
Circumference = 2π·r = 2·π·2 = 4·π ≈ 12.6 cm
Area = π·r²= π·2² = 4π ≈ 12.6 cm²
3 and 4 are similarly solved
Calculate the arc length and area for each sector.
Arc length = 2·π·r· (x/360) and Area of sector = π·r²(x/360)
1. Given: radius = 21 m, and angle of sector x = 133°
Arc length = 2·π·r· (x/360) = 2·π·21· (133/360) ≈ 48.7 m
Area of sector = π·r²(x/360) = π·21²(133/360) ≈ 511.8 m²
2. Given: radius = 3.4 Km , and angle of sector x = 22°
Arc length = 2·π·r· (x/360) = 2·π·3.4· (22/360) ≈ 1.3 Km
Area of sector = π·r²(x/360) = π·3.4²(22/360) ≈ 2.2 Km²
3 and 4 are similarly solved