Let us name the figures from left to right as Figures 1,
2, 3, and 4.
Figure 1: Cylinder
The formula for surface area of cylinder is:
SA = 2 π r h
where r = 5 cm and h = 10 cm
SA = 2 π (5 cm) (10 cm)
SA = 100 π cm^2 = 314.16 cm^2
Figure 2: Triangular prism
SA = (a + b + c) h
where a, b, c are the sides of the triangle and h is the
length of the prism
a = 4 m
b = c = 2.5 m
h = 6 m
SA = (4 m + 2.5 m + 2.5 m) 6 m
SA = 54 m^2
Figure 3: Rectangular prism
SA = 2lw + 2wh + 2lh
where l, w and h are the sides
l = 3.5 ft
w = 2.4 ft
h = 5.2 ft
SA = 2 (3.5*2.4 + 2.4*5.2 + 3.5*5.2)
SA = 78.16 ft^2
Figure 4: Rectangular prism
SA = 2lw + 2wh + 2lh
where l, w and h are the sides
l = 6 ft
w = 4.5 ft
h =12 ft
SA = 2 (6*4.5 + 4.5*12 + 6*12)
SA = 306 ft^2
