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1386=22/7 ×r^2
1386×7:22 = r^2
441= r^2
r= akar dari 441 =21 cm
panjang garis tengah(d) = 2.r
jadi 2×21= 42 cm.
semoga kamu ngerti dan jwbn aku dpt membantu tolong jdikan jwbn terbaikya:)
phi x r x r = 1386
r^2 =1386 x 7 /22
r = 21
panjang garis tengah = d
d = 2r = 2 x 21 = 42