Step-by-step explanation:Answer:
As it is equilateral triangle, l₁ = l₂ = b = 6 cm
Total surface area of triangular prism= (l₁ +l₂ + b)* height
= ( 6 + 6 + 6) * 15
= 18 * 15
= 270 cm²
2) length = l = 8.2 in
Width = w = 3.4 in
height = h = 2
Total surface area of rectangular prism = 2*(lw + wh + hl)
= 2*(8.2*3.4 + 3.4*2 + 2*8.2)
=2 *( 27.88 + 6.8 + 16.4)
= 2 * 51.08
= 102.16
= 102 in²
