Question

NO. 20 Dengan cara Penyelesaiannya

Answer 1

1/3 A.t = V
1/3 A.(39) = 7.200
A = 3(7200)/39
A = 7.200/13
A = 553,85
s = √553,85
s = 23,54

t. = √(39)² + (11,77)²
t = √ 1.521 + 138,53
t = √1.659,53
t = 40,74

L Δ = 1/2 s.t
       = 1/2 (23,54)(40,74)
       = 479,51

4LΔ = 4(479,51)
         = 1.918,04

Luas Permukaan = 1.918,04 + 553,85
                               = 2.471,89 (yang medekati 2.324)