Calculate the perimeter (in ) of this composite rectilinear shape.
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Relevant wiki: Length and Area
Let the other 4 sides be denoted as a , b , c and d as shown above.
Since we are given that the shape is rectilinear, then the side lengths a and b are parallel to each other, and their sum a + b is equal to the bottom side length of the figure, 1 0 cm .
Similarly, the side lengths c and d are parallel to each other, and their sum c + d is equal to the left length of the left side length of the figure, 1 5 cm .
Hence, the perimeter of the composite figure is
1 5 cm + 1 0 cm + ( a + b ) + ( c + d ) = 1 5 cm + 1 0 cm + 1 0 cm + 1 5 cm = 5 0 cm