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= 2 . 3.14 . 10
= 62,8 cm
luas = π .r²
= 3,14 . 10²
= 3,14 . 100
= 314 cm²
5) keliling = 2 .π .r
= 2 . 3,14 .40
= 251,2 cm
luas = π . r²
= 3,14 . 40²
= 3,14 . 1600
= 5024 cm²
6) d = 70 cm -----> r = 35 cm
keliling = 2 .π .r²
= 2 . . 35
= 22 . 10
= 220 cm
luas = π .r²
= . 35²
= 22 . 5 . 35
= 3850 cm²
7) d = 84 cm ---> r = 42 cm
keliling = 2 .π . r²
= 2 . . 42
= 12 . 22
= 264 cm
luas = π .r²
= . 42²
= 22 . 6 . 42
= 5544 cm²
8) d = 100 cm -----> r = 50 cm
keliling = 2 .π . r
= 2 . 3,14 . 50
= 314 cm
luas = π .r²
= 3,14 . 50²
= 3,14 . 2500
= 7850 cm²