Seven Deadly Sines Square

MooglyCAL 2025

Read the Story:

Or feel free to skip straight to the pattern. It won’t hurt my feelings!

When I made the “Perfect Squares Square” last year for MooglyCAL 2024, I was inspired to make this year’s square with yet another math-inspired theme.

I present to you the “Seven Deadly Sines Square” – a play on words that incorporates both math and the stitches used in this square.

How are these related? To start, this pattern uses six stitches – single, half double, double, treble, double treble, and triple treble crochet. But wait? Where does the seventh come in? Why that would be the pride that you’ll experience when you finish this piece! Either that or you could count the chain stitches at the beginning as the seventh, but I think the pride thing is far more suitable.

Oh, and there happens to be seven total stripes, but that might just be a coincidence and not at all intentional!

As far as the math side of things, “sine” is one of the foundational ratios in trigonometry – the study of the relationships between angles and sides in triangles. When extended to include the rotational nature of angles using a unit circle on a coordinate plane, the sine function produces a very pleasing wave pattern. This regularity is used to describe anything that moves in cycles – seasons, holidays, even life itself – and it’s especially good at representing the meditative practice of crochet.

So ride those seven deadly sine waves as you craft this simple square!

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Seven Deadly Sines Square

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	Materials & Pattern Information
Yarn	Caron One Pound, “Royalty” (MC) and “Sunflower” (CC) 100% acrylic CYC 4 (Worsted) weight, 9 wpi 812yd/16oz (742m/454g) per skein (1 skein each color)
Hook	US J/10 (6mm) Recommended hooks: Furls, Clover Amour, Tulip Etimo
Notions	Yarn Needle, Scissors,  Stitch Marker*, Blocking Mats, Blocking Pins *optional to mark first and last stitches of each rows
Challenge Level	For adventurous beginners. Techniques include the basics (single, half double, double, and treble crochet) as well as two less common stitches (double treble and triple treble).
Finished Size	12 x 12 in (30.5 x 30.5 cm) - blocked
Gauge	4” (10cm) worked in pattern: 13 sts, 4.5 rows

Check out the tutorial video for pattern support:

Stitch Information
Abbreviations Used CC Contrasting color Ch(s) Chain(s) Dc Double crochet *Dtr Double treble crochet Ea Each Hdc Half double crochet Hk Hook Inc Increase Lp(s) Loop(s) MC Main color Rem Remaining RS Right side Sc Single crochet Sk(d) Skip(ped) Sl st Slip stitch St(s) Stitch(es) TLO Third loop only Tr Treble crochet *Ttr Triple treble crochet WS Wrong side YoYarn over	*Uncommon stitch instructions: Dtr Yo 3 times, insert hk into st, yo, pull up a lp (5 lps on hk), [yo, draw through 2 lps] 4 times. Ttr Yo 4 times, insert hk into st, yo, pull up a lp (6 lps on hk), [yo, draw through 2 lps] 5 times.

Notes (definitely don’t skip)

• Stitch counts are only given after the first row and are presented inside <> brackets. If no stitch count is given, the stitch count is the same as the previous row.

• When changing colors, draw the new color through the final lp of the stitch (for example, work a triple treble crochet until you have 2 loops remaining, drop the current color, yarn over with the next color and draw through those final two loops)

  • This will create clean transitions between your colors.

Pattern Instructions

Notes	Ch-1 turning ch does not count as a st.
Setup	With MC ch 42.
Row 1 (RS)	First time: Sc in second ch from hk, hdc, dc, tr, dtr, ttr, dtr, tr, dc, hdc, sc, rep from across, turn. <41 sts> Repeats: Ch 1, sc in first st, hdc, dc, tr, dtr, ttr, dtr, tr, dc, hdc, sc, rep from across, turn.
Row 2 (WS)	Ch 6 (counts as ttr now and throughout), sk first st, dtr, tr, dc, hdc, sc, hdc, dc, tr, dtr, ttr, rep from across, change to CC, turn.
Row 3	Rep Row 1 with CC.
Row 4	Rep Row 2 changing back to MC at end.
Rows 5-14	Rep Rows 1-4 another two times, rep Rows 1-2 once more.
Border	With RS facing you, ch 1, sc in ea st to corner, 3 sc in corner st, sc evenly along sides of rows to corner, 3 sc in corner ch, work 1 sc in ea ch along bottom of square to corner, 3 sc in corner ch, sc evenly along sides of rows, 2 sc in first st (should already have 1 sc worked in it), join with sl st into first st, fasten off. Weave in ends.
Finishing	Weave in loose ends. Wash and block to 12” by 12” (30.5 by 30.5 cm). Enjoy!

Copyright, Selling Finished Projects, and Pattern Support

This pattern is designed and copyrighted by Cocky Crocheter LLC as a free pattern for part of the Moogly CAL 2023. No part of this pattern – including images, charts, and instructions – may be shared or reproduced.

Items created using this pattern are allowed to be sold with credit given to Kelly Baum-Sehon (The Cocky Crocheter) as the original designer of the pattern. Feel free to share on Instagram and tag me @cocky_crocheter; I love seeing your beautiful work! Additionally, feel free to tag Tamara @mooglyblog and use hashtag #mooglyCAL2023.

The designer has made every effort to make instructions clear, but confusion can still arise. The designer is always willing to offer pattern support if you have questions about any of the instructions.

Contact the designer with any questions regarding copyright, selling finished projects, and pattern support at kbaumsehon@gmail.com.