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OE tegak lurus dengan AB atau EB
oc=r=20
ce=8
mka, oe=20-8
=12
jka ditarik grs dri O ke B=r=20
shg mmbentuk segitiga siku-siku.
mka, eb² =ob²-oe²
eb² =20²-12²
eb² =400-144
eb² =256
eb =√256
eb =16
AE=EB
AE=16
maka,
AB=AE+EB
AB=16+16
AB=32 cm
jawababnya:C.32 cm