tolong diisi pake cara yaa

i = 72°
n = 360°
r = 7 m
biaya = Rp 50.000,00/m
(berbentuk juring)
K = ( i/n × K lingkaran ) + ( 2 × r )
= ( i/n × 2 × phi × r ) + ( 2 × r )
= ( 72°/360° × 2 × 22/7 × 7 ) + ( 2 × 7 )
= 8,8 + 14
= 22,8 m
seluruh biaya = K × biaya
= 22,8 m × Rp 50.000,00/m
= Rp 1.140.000,00 (B)