1. The area of one face of the bar is .. face area = (50 mm)*(90 mm) = 4500 mm^2 The area of two sides of the bar is .. side area = (50 mm +90 mm)*(3.5 mm) = 490 mm^2
Together, those areas cover half the bar, so the total paper required is .. 2*(4500 mm^2 +490 mm^2) = 9980 mm^2 . . . . . . 3rd selection
2. The length of the central rectangle is .. 8 ft + 6 ft + 10 ft = 24 ft Its width is 7 ft, so its area is .. Arect = (7 ft)*(24 ft) = 168 ft^2
Each of the two triangles has a base of 8 ft and a height of 6 ft, so together, they have an area of .. Atriangles = (8 ft)*(6 ft) = 48 ft^2
Then the total area of the prism is .. Atotal = Arect +Atriangles .. = (168 ft^2) +(48 ft^2) .. = 216 ft^2
