A= 2lw+2lh+2wh
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To find the area of a rectangle, you multiply the width by the length. Area=width multiplied by length. To find the perimeter of a rectangle, you can either add all four sides of the rectangle together (p=w+w+l+l), or find the length and width of the rectangle and multiply that by 2 (p=2(w+l)). You can also find the perimeter by multiplying the width by 2 and the length by 2 and then adding those together (p=2w+2l).
Rectangle: length x width triangle: (base x height)/2
Area = 2*5 = 10 square inches
Area of circle = pi*212 = 1385.44236 square cm Area of rectangle = 1385.44236 square cm Lenght of rectangle = 1385.44236/18 = 76.96902 cm Perimeter of rectangle = 2(76.96902)+2(18) = 189.93804 cm
Perimeter is the distance around the figure. Add all sides. Area depends on the figure. Triangle --- 1/2 bh Rectangle --- lw. Others --- divide into triangles and find the area of each triangle then add all together.