16. gambar diatas termasuk jaring jaring bangun limas segitiga

17. L= 2 x { (pxl) + (txl) + (pxt) }

= 2 x { (15 x 8 ) + (10 x 8) + (15 x 10)

= 2 x ( 120+80+150 )

= 2 x 350

= 700 cm2

18. v = 1/3 × luas alas × luas tinggi

v = 1/3 × π × r2 × t

v = 1/3 × 22/7 × 21 × 21 × 18

v = 22 × 21 × 18

v = 8.316 cm3

19. panjang alas= 12 cn

lebar alas= 5 cm

tinggi limas= 18 cm

voluma limas

= 1/3 × (panjang alas × lebar alas) × luas tinggi

= 1/3 × (12 × 5) × 18

= 1/3 × 60 × 18

= 360 cm^3

20. Volume tabung

V = π × r² × t

176 = 22/7 × r² × 14

176 × 7 = 22 × 14 × r²

1,232 = 308 × r²

r² = 1,232 / 308

r² = 4

r = √4

r = 2 cm

R jari jari tabung 2 cm

maaf kalo salah :v