Question

1. which of the measurements below is likely the circumference of this tire: lt290/85r15?○ 108.02 inches○ 34.94 inches○ 19.94π inches○ 9.97 inches

Explanation:

Step1: Extract tire diameter

The tire code LT290/85R15 means:

• Section width: 290 mm
• Aspect ratio: 85%
• Rim diameter: 15 inches

First convert section width to inches: $290\ \text{mm} \times \frac{1\ \text{inch}}{25.4\ \text{mm}} \approx 11.42\ \text{inches}$

Step2: Calculate sidewall height

Sidewall height = section width × aspect ratio
$\text{Sidewall height} = 11.42 \times 0.85 \approx 9.71\ \text{inches}$

Step3: Calculate total tire diameter

Total diameter = rim diameter + 2×sidewall height
$\text{Total diameter} = 15 + 2\times9.71 = 34.42\ \text{inches}$

Step4: Calculate circumference

Circumference formula: $C = \pi d$
$C = \pi \times 34.42 \approx 108.13\ \text{inches}$

Answer:

108.02 inches