P.O.D. #5 basic advanced 4 in 2 in Find the area of the figure above. Find the area of the trapezoid above. 7 cm 5 cm 3 cm A = ½ (b 1 + b 2 ) h = ½ (5 cm + 7 cm) 3 cm = ½ (12 cm) 3 cm = 18 cm 2 A 1 = b h = 2 in 2 in = 4 in 2 A 2 = b h = 2 in 4 in = 8 in 2 Total Area = 4 in in 2 = 12 in 2
Surface Area of Prisms
A prism is a three-dimensional figure with at least two parallel congruent faces called bases that are polygons.
Triangular PrismRectangular Prism
Surface area (S.A.) is the sum of the areas of all the surfaces, or faces, of a three-dimensional figure. Surface area is measured in square units.
Surface Area of a Rectangular Prism S.A. = 2 l h + 2 l w + 2hw Length: l Width: w Height: h
Example: S.A. = 2 l h + 2 l w + 2hw = 2(4in 5in) + 2(4in 7in) + 2(5in 7in) = 40 in in in 2 = 166 in 2
3 in 4 in 5 in 8 in 3 in4 in 5 in 8 in 3 in 4 in 5 in Example: 6 in 2 24 in 2 32 in 2 40 in 2 S.A. = 6 in in in in in in 2
S.A. = 2 l h + 2 l w + 2hw = 2(2ft 3ft) + 2(2ft 6ft) + 2(3ft 6ft) = 12 ft ft ft 2 = 72 ft 2 Whiteboard: