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Sagot :

The perimeter of the semicircular region is the circumference of the semicircle plus the diameter

  • Formula for circumference of a semicircle --> [tex]\frac{1}{2} \pi d = \pi r[/tex]

                 d: diameter length

                  r: radius length

6. [tex]Perimeter=\frac{1}{2}\pi d + d= \frac{1}{2} \pi *18+18=9\pi +18 = 46.26cm[/tex]

7. [tex]Perimeter =\frac{1}{2}\pi d+d= \frac{1}{2} \pi *20+20 = 31.4+20=51.4 in[/tex]

8. [tex]Perimeter=\pi r+2r = \pi *4 + 8=20.56mm[/tex]

Hope that helps!