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4. L= π×r²                      L= π × r²
      =22/7× 14×14            = 3,14 ×10 ×10
      = 616 cm²      -           = 314 cm²        = 302 cm²
5.A     L   =π×r²                B.   K= π×D          C.   942 ÷6 =157 pohon
      70650=3,14×r²                    =3,14×300
          r²   = 70650 ÷ 3,14          =942 m
          r²   = 22500
          r    =150 m
          D  = 300 M