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a. 3,14 * 28,5 = 89,49
b. 3,14 * 25,5 = 80,07
c. 3,14 * 31 = 97,34
d. 3,14 * 4 = 12, 56
e. 3,14 * 8 = 25,12
luas = 1/4πd²
a. 1/4 * 3,14 * (28,5)² = 637,61625
b. 1/4 * 3,14 * (25,5)² = 510,44625
c. 1/4 * 3,14 * (31)² = 754,385
d. 1/4 * 3,14 * (4)² = 12,56
e. 1/4 * 3,14 * (8)² = 50,24
a) π×28,5=3,14×28,5=89,49
b) π×25,5=3,14×25,5=80,7
c) π×31=3,14×31=97,34
d) π×4=3,14×4=12,56
e)π×8=3,14×8=25,12
luas
a) 3,14×()²=637,62
b) 3,14×()²=510,45
c) 3,14×()²=754,39
d) 3,14×()²=12,56
e) 3,14×()²=50,24