1 foot=30.48cm
1 inch=2.54cm
5*30.48cm=152.4cm
3*2.54cm=7.62cm
152.4cm+7.62cm=160.02cm
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Area of Triangle = 1/2 base x height 28 = 4 x height height = 7 cms
15 cm * 15 cm = 225 sq cms
45 sq cms
6.75/7(22 inches + 56 cm) = 21 inches + 54 cm. Rounded to 2 significant figures.
The height of the base is part of the triangle and the height of the prism is the height of the rectangle