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Area Formulas
Area
Rectangular Prisms
Triangular Prisms
100
A = base x height
Parallelogram
100
Parallelogram with a base of 4 cm and height of 9 cm
36 square cm
100
Surface area with a length of 4 m, width of 2 m, and height of 1 m
28 square m
200
Triangle
A = 1/2 x base x height
200
Triangle with a base of 10 m and a height of 5 m
25 square meters
200
Surface Area with a length of 4 in, width of 3 in, and height of 5 in
94 square in
300
Trapezoid
A = 1/2 x (base1 + base2) x height
300
Trapezoid with a height of 4 ft, and bases of 3 ft and 7 ft
20 square feet
300
Surface area with length of 2.5 cm, width of 3 cm, and height of 10 cm 
125 square cm
300

Triangular prism: length = 3 in, height = 4 in, length = 10 in (sides of triangle are both 8 in)

202 square in
400
Area of a triangle with a base of 7 in and a height of 5 inches
17.5 square inches
400
Rectangular prism: length = 1 1/4 ft, width = 8 ft, height = 1/2 ft
29 1/4 square ft

or

29.25 square ft

400
Triangular prism: length = 10 mm, width = 14 mm, height = 12 mm (each side of triangle sides are 13 mm)
624 square mm
500
Area of a trapezoid with a height of 4.2 mm, and bases of 4 1/2 mm and 3 1/4 mm
16.275 square mm

or 

16 11/40 square mm

500
Right triangular prism: length = 4 in, width = 7 in, height = 3 in (side of triangle 5 in)
96 square inches