Divide a b into twenty-two equal parts, orits half into eleven. Take three and a half ofthese parts, which will he the radius fordescribing the circumference, as required. PROBLEM XVIII. To find a right line equal to any given arc. … First describe the circumference accordingto one of the preceding problems. Through thepoint A and the centre o draw a d. Make c dequal to one-fourth of the radius o c. Drawthe indefinite line a e perpendicular to a d.Through d and b draw d e, and the line a ewill be equal to the arc a b nearly.…
Design · Decoration and ornament · Art
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