For this question the answer is 2.5m (B) You find this by: L=0.85m W=0.4m
A rectangle had 4 sides (2 lengths and 2 widths) So... To find 1 length and 1 Width you do 0.85+0.4=1.25m Now you want to find the other 2 sides (L and W) You can do: the same method and add it to 1.25m OR... You can do (I prefer this one): (0.85+0.4)x2=? This is the same as 0.85+0.4=1.25 1.25x2=2.5m