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r = 1/2 d = 1/2 x 70
r= 35 cm
phi = 22/7
L = phi r²
= 22/7 x 35 x 35
= 22 x 5 x 35
= 3850 cm² (a)
8. L= 452,16 cm
phi = 3,14
L = phi r²
452,16 = 3,14 x r²
452,16/3,14 = r²
144 = r²
√144= r
12 = r
diameter= 2r
=2x 12
=24 cm (d)
*phi-nya pake lambang yak, soalnya disini gak ada simbolnya