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It is the sum of the areas of all the components.
The simplest Pythagorean triangle is 3, 4 and 5. Double this gives 6, 8 and 10 so the sides of your rectangle are 6 cm & 8 cm.
A pentagon has 5 sides. A regular pentagon has sides of all the same length. So a regular pentagon of side 5cm has a perimeter of 5 x 5cm = 25cm.
Pentagon means five sides. If one side is 4cm, then the perimeter which is the total length of all the sides is 4cm multiplied by 5 equals to 20 cm.
Use Pythagoras'theorem:- 52+42 = 41 and the square root of this is the hypotenuse which is about 6.403124237 units in length