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3/8 inch is the height of one dog ear!!! So for the strip size for the easy angle ruler just remove the 3/8 inch from the square size that's supposed to be cut into 1/4's .

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from Cazoom Maths Worksheets

Geometry Resources

Formula for Area of a Triangle

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The formula for half-square triangle quilt blocks.

from The Primary Gal

Discovering the Formula for Area of a Triangle!

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from The Craftsy Blog

How to Make a Square-in-a-Square Quilt Block: A Tutorial

Formula for calculating size of triangles for a square-in-a square block

from Scarlet Dash Blog

Geometric Crocheted Shape Formulas, Works for Circles,Triangles, Squares and Hexagons

Geometric Crocheted Shape Formulas, Works for Circles,Triangles, Squares and Hexagons | Scarlet Dash Blog

from Blossom Heart Quilts

HST Tutorial and Maths Formula