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A)
r = 70 m
Keliling
= 2 . π . r
= 2 x 22/7 x 70
= 2 x 22 x 10
= 440 m
B)
banyak pohon jati
= Keliling : jarak antar pohon
= 440 m : 4 m
= 110 buah
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2)
Ukuran sisi 6, 8 dan 10
merupakan triple pythagoras, maka segitiga nya adalah segitiga siku2
Luas
= 1/2 x a x t
= 1/2 x 6 x 8
= 24 cm²
Jari-jari lingkaran luar
= (abc) / 4L
= (6 .8 .10) / 4(24)
= 480/96
= 5 cm