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180= 1/2 X La X15
180=15/2 X La
La= 180:15 X 2
La = 24 dm pangkat 2
180 = 3,14 . r² . 15
r² = 180 / ( 3,14 . 15 )
r² = 180 / 47,1
r² = 3,821
r = 1,95
r = 2 dm
La = L lingkaran
La = πr²
= 3,14 . 3,821
= 11,99794
= 12 dm²