4. create a method to calculate the areas of each of the shapes. Triangle area is 1/2 x base x height If the height is unknown, but all 3 sides are known, use the area of the scalene triangle formula. (Research and get the formula that involves calculating the semiperimeter). If two sides and one angle are known use the law of cosines to determine the remaining unknown sides. Area of the square/rectangle/parallelogram/rhombus length x breadth 4. create a method to calculate the areas of each of the shapes. Triangle area is 1/2 x base x height If the height is unknown, but all 3 sides are known, use the area of the scalene triangle formula. (Research and get the formula that involves calculating the semiperimeter). If two sides and one angle are known use the law of cosines to determine the remaining unknown sides. Area of the square/rectangle/parallelogram/rhombus length x breadth