Flag of Eritrea — construction sheet
Own work.  Eritrea’s flag is a rectangle divided into three triangles: a red isosceles triangle based on the hoist side, and a green upper and blue lower right triangle. A gold wreath encircling a gold olive branch is centred on the hoist side of the red triangle.— from the Ministry of Information government portal
 See also File:Flag of Eritrea Requirements.png.
The dimensions on this construction sheet match those shown at Flags of the World (FOTW) except that FOTW does not provide dimensions for the width or height of the wreath.
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