1a. Circumference formula is 2πr. You have your radius so plug that into the formula: 2π2.6 (I recommend using a scientific calculator for this or use desmos)
=16.3 yd
1b. Before we start we need to get the radius. Diameter is 2 times the length of the radius so we can divide the diameter by 2: 4/2=2 m
Then plug it into the same formula, 2π2
=12.6 m
2a. Diameter/2=9.8/2=4.9in
Plug it into the formula: 2π4.9
=30.8 in
2b. Diameter/2=1.9/2=0.95 m
Plug it into the formula: 2π0.95
=6.0 m
Hope this helped!
