Question

find the circumference of each circle to help crack the code and answer the did you know..? question below (answers to 1dp).
a (circle with diameter 5) 15.7
b (circle with diameter 8) 25.1
c (circle with diameter 3.7*2=7.4) 11.6
d (circle with diameter 11) 34.6
e (circle with diameter 16) 50.3
f (circle with diameter 2.9) 9.1
g (circle with radius 6, diameter 12)
h (circle with radius 9, diameter 18)
i (circle with radius 8.2, diameter 16.4)
j (circle with radius 4.4, diameter 8.8)
k (circle with radius 12, diameter 24)
l (circle with radius 7.5, diameter 15)

Explanation:

Step1: Recall circumference formulas

Circumference: $C = \pi d$ or $C = 2\pi r$, where $d$ = diameter, $r$ = radius.

Step2: Calculate Circle G (d=6)

$C = \pi \times 6 \approx 18.8$

Step3: Calculate Circle H (d=9)

$C = \pi \times 9 \approx 28.3$

Step4: Calculate Circle I (d=8.2)

$C = \pi \times 8.2 \approx 25.8$

Step5: Calculate Circle J (d=4.4)

$C = \pi \times 4.4 \approx 13.8$

Step6: Calculate Circle K (d=12)

$C = \pi \times 12 \approx 37.7$

Step7: Calculate Circle L (d=7.5)

$C = \pi \times 7.5 \approx 23.6$

Answer:

G: 18.8
H: 28.3
I: 25.8
J: 13.8
K: 37.7
L: 23.6