Please friend.tolonggggggg

Phytagoras
c = sisi miring
b = tinggi = 9
a = alas = 18 (hanya setengah)

c =√18² + 9²
c =√324 +81
c=√405
c = 20,1...
c = 20 cm (dibulatkan)
jadi sisi miring nya 20
mf kl slh