# 10.7.7. Areas

Find the area of a triangle , approximated to the nearest 2 decimal places, in which cm, cm, and .

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Determine the area of a regular octagon that has a side length of 5 cm approximating the result to the nearest hundredth.

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The diagonals of a quadrilateral have lengths of cm and cm. Given that the measure of the included angle between them is , determine the area of the quadrilateral approximating the result to the nearest square centimeter.

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Determine the area of a regular pentagon that has a side length of cm rounding the result to the nearest thousandth.

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