Question

What is the perimeter of 2m 10cm by 45cm

Answer 1

Add up all the sides! :)
and did you mean 2m or 2cm?

if you meant 2m...
2m = 200cm
so  200cm + 10cm + 45cm = answer

of if you meant 2cm
then  2cm + 10cm + 45cm = answer

Answer 2

the correct question is

What is the perimeter of a rectangle that is 2m 10cm by 45cm?

we know that

The perimeter of a rectangle is equal to

$P= 2L+2W$

where

L is the length of the rectangle

W is the width of the rectangle

In this problem we have

$L=2\ m\ 10\ cm = 200\ cm+10\ cm=210 \ cm \\ W=45\ cm$

substitute the values in the formula

$P= 2*210+2*45$

$P= 420+90$

$P= 510 \ cm$

therefore

the answer is

The perimeter is equal to $510 \ cm$