A mountain bike tire completes 20 revolutions and travels 136 feet. Rounded to the nearest inch, what is the diameter of the bike’s tire? Use 3.14 for π
we know that one revolution is equal to the circumference of a circle circumference C=pi*D where D is the diameter of a circle
step 1 divide 136 ft by 20 revolutions so 136/20=6.8 ft that means one revolution is 6.8 ft C=6.8 ft C=pi*D pi*D=6.8------> divide by pi both sides----> D=6.8/pi D=6.8/3.14-------> D=2.166 ft convert to in 1 ft---------> 12 in 2.166 ft----> x x=2.166*12----> x=25.98 in-------> 26 in
