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OQ = 2r (panjangnya sama r + r = 2r) [ sisi mirng]
OP = r juga
siku2 di P
phytagoras
OQ² = OP²+QP²
OP² = r² =( 2r)² - (4√3)² = 4r²-16.3
3r² = 16.3 [ coret 3nya]
r² = 16 maka r = 4 C