So, the four lines needed to be drawn make two pairs. The pairs need to be parallel. So, the pair of lines that are longer will need to be 8cm long and the other pair of lines need to be 5cm long, problem solved :-)
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Well, you know that in order to classify a shape as a rectangle all of the sides have to be congruent or 90 degrees. If you draw the diagonal of that rectangle, you come up with two right triangles. So you can use the Pythagorean theorem (a squared+b squared=c squared) to find out the diagonal. Ex: If the length=4, and width=3, then diagonal=5, because 4 squared+3 squared=5 squared.
26cm
80 meters
35
One possibility is 15 x 5 (therefore perimeter is 15 x 15 x 5 x 5 = 40cm).