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= akar 49-4
= akar 45= 3akar5
L OABC= 2 x 1/2 x 2 x 3akar5
L= 6akar5 cm^2 (jawabannya C)
=
=
=
L.segitiga OAB
= 1/2 x x 2
=
L. OABC
= x 2
= cm² (c)