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Is thumbtack a compound word?
Yes, thumbtack is a compound word made up of 'thumb' and 'tack'.
How could you use a piece of string thumbtack and a pencil to construct a circle with radius AB?
Loop the string around the thumbtack and the pencil so that the distance from the tack to the pencil point is AB units. Fix the thumbtack to where you want the centre of the circle. Using the pencil, and with the string taut, mark its positions. These will lie on a circle with radius AB.
What do a decimal point and a thumbtack have in common?
They both have a point.
What is the most appropriate unit to measure the width of a thumbtack?
The head or the point of the pin? I would measure the head in millimeters and the point of the pin in micrometers.
What is a thumbtack?
A thumbtack is a small metal object that consists of a parabola with a short, pointy metal spike protruding from its vertex. It is used to temporarily affix paper to an appropriate surface, especially a bulletin board. It recent years, its popularity has waned and it has largely been replaced by pushpins, which are similar objects with a different shape that use more plastic than metal.
