math / on snails tail block
 

I want to make shakespeare in the park my 4 center squares will be 3.5 so I have to add 4 rounds of half triangles to make 12.5
my question is each round come out with the1/2 for seam
like the first round looks like it will come out to 7, before seaming the next round.
Is this Right as I don`t want to mess up my beautiful batik!
Thanks Gale

Here is my block cut out. I was very lucky to find this very lite batik.
Gale

Well I was way out my first round I could sq to 4 3/4 or should it be 4.5? center is 3 finished the triangle for this round were cut 3 inch sq then half the next round is 3 7/8 cut in half next round 5 1/8 cut in half last is cut 6 7/8 cut in half
Thanks Gale

I have been wanting to make one in purples and pinks but I have a pattern from a magazine that I was going to follow. Hopefully, someone will be able to post an answer to your question. It is going to be stunning using batiks. :)

I thought I could do this as I consider my self intermediate but because judy marint book doesn`t give each round size I`m lost. I emailed judy`site hope I get an answer.The rest of the blocks not hard but I did my fgeese not her way.
Gale

You can use this site to calculate the dimensions of a square in a square, which is what snail's trail is after the first 4 patch.

http://www.quiltersparadiseesc.com/C...Calculator.php

THanks Dunster, was wondering if there was a chart.so my 3 inch finished center sec roud should be 4 3/4 according to chart wich I have ope is works to 12.5
ThanksGale

I must be dense because I couldn`t work it up to 125
Think I will make a trip to qs.
Thanks anyway Gale

Gale - Are you looking to find out what size each "square" should measure after sewing each round? For a 12 " finished" block it will end up as 12.5 unfinished so .....

the first 4 patch unfinished should be 3 1/2"
The second square unfinished should be about 4 3/4"
The next square unfinished should be 6 1/2"
The next unfinished should be 9"
and the last will be 12.5" unfinished

Thank you! I will try it out! This is clear.
Gale