apa ya jawaban nomor 16,17,18?

16. K = 2(p + l)
48 = 2(l + 4 + l)
48 = 2(4 + 2l)
48 = 8 + 4l
4l = 48 - 8
4l = 40
l = 40/4
l = 10 cm

L = p × l
L = (l + 4) × 10
L = (10 + 4) × 10
L = 14 × 10
L = 140 cm² (B) ✔

17. L = s²
324 = s²
s = √324
s = 18 cm

K = 4s
K = 4(18)
K = 72 cm (D) ✔

18. K = 4s
20 = 4s
s = 20/4
s = 5 cm

½ d₂ = √s² - (½ d₁)²
½ d₂ = √5² - (8/2)²
½ d₂ = √25 - 4²
½ d₂ = √25 - 16
½ d₂ = √9
d₂ = 3 × 2
d₂ = 6 cm

L = ½ × d₁ × d₂
L = ½ × 8 × 6
L = 24 cm² (C) ✔