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Sagot :
the length of arc:
[tex]\tt =\dfrac{\alpha }{360}\times 2\pi.r[/tex]
5.
[tex]\tt \dfrac{90}{360}\times 2\pi6= 3\pi~yd[/tex]
7.
[tex]\tt \dfrac{135}{360}\times 2\pi.8=6\pi~km[/tex]
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