The perimeter is the distance around the outside of a 2D shape. The distance can be measured in units like millimetres, centimetres, metres and kilometres. To work out the perimeter, add up the ...

ZACH: Our virtual house design is looking pretty cool. There’s something missing though. KAYLA: Some windows might be nice. ZACH: Oh yeah, I designed some earlier. ADA: To build the windows, you need ...