The element silicon is used extensively as a semiconductor in solid-state devices in the computer and microelectronics industries. For this, hyperpure silicon is needed. The silicon is selectively doped with tiny amounts of boron, gallium, phosphorus or arsenic to control its electrical properties.
Â· just now. Asker's rating. Report Abuse. An acre is a measure of area that I will call A for now. L*W = A which gives L = A/W C = 2*(L + W) = 2*(A/W + W) So, as you can see, the circumference depends on the width (or L, whichever way you want to look at it).
An acre is traditionally a field that could be plowed in one day using oxen. It was 220 yards long and 22 yards wide, so its area is 22 x 220 = 4840 square yards. Also, an acre equals 43,560 square feet. A square yard equals 9 square feet. An acre equals 4840 square yards (43,560 divided by 9)