bagaimana cara nomor 7?

tinggi segitiga = t1
tinggi prisma = t2

a x t1 : 2 x t2 = V
a x 15 : 2 x 30 = 4.500
a x 225 = 4.500
a = 4.500 : 225
a = 20 cm

sisi miring alas = √20²+15² = √400+225 = √625 = 25 cm

Keliling alas = a + t + sisi miring = 20+15+25 = 60 cm

Luas alas = a x t : 2 = 20 x 15 : 2 = 150 cm²

L permukaan = 2 x L alas + keliling alas x t2
= 2 x 150 + 60 x 30
= 300 + 1.800
= 2.100 cm² (C)

maaf klo salah dan semoga membantu