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A triangle has a base of 8.4 cm and a height of 12.5 cm. What is the area of the triangle?
A calendar is determined by using each of the 12 faces of a regular dodecahedron for one month of the year. With each side of the regular pentagonal face measuring 4cm, the area of each face is approximately 27.5 cm2. a What is the total surface area of the calendar? b If the material used to construct the calendar costs 0.8 of a cent per square centimeter, what is the cost of the materials used in construction?
Find the area of an equiangular triangle with a a perimeter of 24.6 cm. b radius of length 4 in.
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