Step-by-step explanation:
The formula of a circumference of a circle with radius r:
[tex]C=2\pi r[/tex]
Solve for r:
[tex]2\pi r=C[/tex] subtitute [tex]\pi\approx\dfrac{22}{7}[/tex]
[tex]2\cdot\dfrac{22}{7}r=C[/tex]
[tex]\dfrac{44}{7}r=C[/tex] multiply both sides by 7
[tex]44r=7C[/tex] divide both sides by 44
[tex]r=\dfrac{7C}{44}[/tex]
Substitute the values of the circumference from your question:
[tex]i.\ C=88cm\\\\r=\dfrac{7\cdot88}{44}=\dfrac{7\cdot2}{1}=12(cm)\\\\=================[/tex]
[tex]ii.\ C=1.4m\\\\r=\dfrac{7\cdot1.4}{44}=\dfrac{9.8}{44}=\dfrac{98}{440}=\dfrac{49}{220}(m)\\\\====================[/tex]
[tex]iii.\ C=16m\\\\r=\dfrac{7\cdot16}{44}=\dfrac{7\cdot4}{11}=\dfrac{28}{11}(m)\\\\=================[/tex]
[tex]iv.\ C=33ft\\\\r=\dfrac{7\cdot33}{44}=\dfrac{7\cdot3}{4}=\dfrac{21}{4}(ft)\\\\=================[/tex]
[tex]v.\ C=5m\\\\r=\dfrac{7\cdot5}{44}=\dfrac{35}{44}(m)\\\\===============[/tex]
[tex]vi.\ C=66m\\\\r=\dfrac{7\cdot66}{44}=\dfrac{7\cdot3}{2}=\dfrac{21}{2}(m)\\\\================[/tex]
