Perimeters and Areas

Kia Ora......
Today for maths , my class and I have been working on perimeters and areas.A perimeter is the outside of a box and that has numbers on each side that you have to add up by using additions and a area is the inside of the box that you have to times the numbers on outside.EG - 10 + 3 = 13 , 13 + 13 = 26 , so 10 x 3 = 30