Question

find the circumference of the circles ⭕ whose diameter is. ​

Answer 1

Answer:

Step by step explanation:

• 1.(i) Diameter = 84 cm
• So, Radius = 84/2 = 42 cm
• Circumference = 2πr = 2*22/7*42 = 44*6 =264 cm
• (ii) Diameter = 91 cm
• Radius = 91/2 = 45.5 cm
• Circumference = 2πr = 2*22/7*45.5 = 44*6.5 = 286 cm
• (iii) Diameter = 42 cm
• Radius = 42/2 = 21 cm
• Circumference = 2πr = 2*22/7*21 = 44*3 = 132 cm
• (iv) Diameter = 21 cm
• Radius = 21/2 = 10.5 cm
• Circumference = 2πr = 2*22/7*10.5 = 44*1.5 = 66 cm
• (v) Diameter = 56 cm
• Radius = 56/2 = 28 cm
• Circumference = 2πr = 2*22/7*28 = 44*4 = 176 cm
• 2.(i) Radius = 5.6cm
• Circumference = 2*22/7*5.6 = 44*0.8 =35.2 cm
• (ii) Radius = 4.9 cm
• Circumference = 2*22/7*4.9 = 44*0.7 =30.8 cm
• (iii) Radius = 6.3 cm
• Circumference = 2*22/7*6.3 = 44*0.9 = 39.6 cm
• (iv) Radius = 8.4 cm
• Circumference = 2*22/7*8.4 = 44*1.2 =52.8 cm
• (v) Radius = 4.2 cm
• Circumference = 2*22/7*4.2 = 44*0.6 = 26.4 cm