mohon di bantu yaaa bsk udh kumpul

38. L = La + 4 × L. segitiga

= (S×S) + 4 × (1/2 × A × T)

= (10×10) + 4 × (1/2 × 10 × 12)

= 100 + 4 × (1 × 10 × 6)

= 100 + 4 × 60

= 100 + 240

= 340 cm^2

39. V = 1/3 × La × T

= 1/3 × (s×s) × T

= 1/3 × (15×15) × 16

= 1/3 × 225 × 16

= 1 × 75 × 16

= 1.200 (d)