If it's a 12 by 5 rectangle then the perimeter is: 12+5+12+5 = 34 cm
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34cm
If two sides of a triangle have lengths of 5cm and 12cm, then the third side can have any length that's more than 7cm and less than 17cm. If the third side is 13cm, then the triangle is a right triangle.
4 x 5cm = 20cm
The circumference of a circle with a radius of 5cm is: 31.42 cm
16 cm 5cm+5cm+3cm+3cm=16cm