Surface Area = the total of the areas of each surface (side) of a figure.
Find Surface Area: 9 m 5 m 4 m 5 m 9 m 9 m 9 m 4 m 4 m 5 m 4 m 9 m 5 m 4 m Rectangle: 9 x 4 = 36 Rectangle: 9 x 5 = 45 Rectangle: 5 x 4 = 20 Rectangle: 5 x 4= 20 __________ Sum of all areas = 202 m 2
Find Surface Area: 8 cm 12 cm 7 cm 5 cm 12 cm 7 cm 5 cm Triangle: ½ x 5 x 7= 17. 5 Triangle: ½ x 5 x 7 = 17. 5 Rectangle: 5 x 12 = 60 Rectangle: 7 x 12 = 84 ____________ Sum of all areas = 263 cm 2
Finding Surface Area without a net…
Find Surface Area: Sketch the shape and dimensions of each surface (side). Sketch each surface of the prism. 5 m 5 m 6 m 16 m 5 m 6 m 6 m 6 m 16 m 5 m
Find areas: Rectangle = 16 x 6 = 106 Rectangle = 16 x 5 = 90 Rectangle = 6 x 5 = 30 Sum of all areas: 452 m 2 5 m 5 m 6 m 16 m 5 m 6 m 6 m 6 m 16 m 5 m
Find Surface Area: Sketch the shape and dimensions of each surface (side). 10 mm 5 mm 16 mm 7 mm
Find Surface Area: Sketch the shape and dimensions of each surface (side). THERE ARE 5 SURFACES! FIND AREA OF 5 SURFACES AND ADD TOGETHER! 10 mm 5 mm 16 mm 7 X 16 7 X 16= 112 10 X 16= 160 1/2 X 5 X 10=25 112+160+25+25= 434 mm 2 7 mm 10 X 16 ½ X 5 X 10 7 mm ½ X 5 X 10