RIScov.pag

For example, to find the radius of an arc that is 12 in. wide and
2 in. high, let A = 12 and B = 2. Then:

R = ————— (12/2)^2 + 2^2

2 x 2

R = _______36 + 4

4

Finally, R = 10. The arc’s radius is 10 in.

—BARRIEGRAHAM,Arundel, Que., Canada

Using Washers for Drawing Curves

I

KEEP A STOCK OF WASHERSin many sizes to use as templates when
drawing rounded corners. Buy one washer of every size from the
hardware store, and hang them on a nail in your shop. For larger
curves, use jar lids and paint can lids. They’re all true circles and less
trouble to use than a compass when only part of a circle is needed.
—PERCYBLANDFORD,Stratford-upon-Avon, England

MEASURING, MARKING & LAYOUT

Keep stack of different-sized washers for

drawing arcs and rounding corners.