Question

A rectangle measures 10 cm by 16cm what is the perimeter

Answer 1

What you do is you try to find the sum of 10 and 16 Which is to add 10+16 and u get 26 so The answer would be 26 
P=26  I hope i helped Good luck 

Answer 2

Perimeter= Length plus Width
L=10
W=16
Don't forget about the parallel sides.
Add: 10 plus 10 = 20
Add: 16 plus 16 = 32
Add: 20 plus 32 = 52
Extra
Area= Length times Width
L:10
W:16
Area: 10 times 16= 160
Don't worry about the parallel sides.