3 A plrza has a diameter of 16 cm . What is the circumference? (Hint \( \mathrm{C}= \) nd or \( \mathrm{C}=2 \mathrm{mr} \) )

To find the circumference of the plaza using the diameter, you can use the formula \( C = \pi d \). Since the diameter is 16 cm, you'll multiply 16 by \( \pi \) (approximately 3.14). So, the circumference \( C \) is roughly \( 16 \times 3.14 \approx 50.24 \) cm. Alternatively, using the formula \( C = 2\pi r \), first calculate the radius \( r \) by dividing the diameter by 2. This gives you a radius of 8 cm. Then, \( C = 2 \times \pi \times 8 \approx 50.24 \) cm. Either way, you'll get a circumference of about 50.24 cm.