FA-97643 / Knitting and sewing pattern grading / Member archive

Flat crochet circle planner: radius per round · case 03

A 10 cm coaster is worked to 20 cm.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Base stitches per round: sc 6, hdc 8, dc 12 (others -> "error: stitch"). Each round adds one round height to the radius. rounds = ceiling(diameter/(2*height)). Round k has base*k stitches. Return [rounds, stitches in last round, total stitches base*rounds*(rounds+1)/2].

Why this case matters

Amigurumi and rug patterns size flat circles by rounds of evenly spaced increases.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
coaster	`[20, 120, 1260]`	`[10, 60, 330]`	Failed

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