Tolong bantu jawab yaa teman-teman

L = La + 4 × L. Segitiga

= (s×s) + 4 × (1/2 × A × T)

= (20×20) + 4 × (1/2 × 20 × 26)

= 400 + 4 × (1 × 10 × 26)

= 400 + 4 × 260

= 400 + 1.040

= 1.440 cm^2 (b)