Challenge Your Exam Readiness With Our Free GED Practice Questions

Circumference CC equals 2πr2\pi r. With r=7r=7,

C=2π(7)=14π≈14×3.14=43.96 cm.C = 2\pi(7) = 14\pi \approx 14 \times 3.14 = 43.96\ \text{cm}.

Option A states both exact and approximate values correctly. Option B (7π7\pi) is half the correct expression—students sometimes forget the factor of 2. Option C (49π49\pi) is the area formula’s core (πr2\pi r^2), not circumference. Option D gives only 2π2\pi, which would be the circumference for a unit circle r=1r=1, not r=7r=7. On the GED, distinguish circumference vs. area: circumference measures distance around (linear units), while area measures covering (square units). A quick check: if radius doubles, circumference doubles (linear), but area quadruples (squared relationship). Keeping formulas paired—C=2πrC=2\pi r and A=πr2A=\pi r^2—helps prevent mixing them during timed problem solving.