biaya untk mmbiat pagar disekeliling lahn adlh?

sisi miring segi 3
s² = 5² + 12²
s² = 25 + 144
s² = 169
s = √169
s = 13 cm

kll 1/4 busur lingkaran
= 1/4 x 2 phi r
= 1/2 x phi r
= 1/2 x 22/7 x 7
= 11/7 x 7
= 7 cm

k = 13+(20-(5+7))+7+7+20+(7x2-12)
k = 13 + 8 + 34 + 2
k = 57 cm

biaya
= 57 x 50.000
= 2.850.000