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ad = 42/2
=21
panjang cd=√ac²-ad²
= √42²-21²
=√1764-441
=21√3
B
cos 30 = sampingx miring
cos 30 = 10 x miring
1/2 √3 = 10 x miring
miring= 20/3 √3
jadi panjang kedua tali adalah 2 x (20/3 √3)
= 40/3 √3