Head First 2D Geometry

Errata for Head First 2D Geometry

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The errata list is a list of errors and their corrections that were found after the product was released.

The following errata were submitted by our customers and have not yet been approved or disproved by the author or editor. They solely represent the opinion of the customer.


Color Key: Serious Technical Mistake Minor Technical Mistake Language or formatting error Typo Question Note Update



Version Location Description Submitted By Date Submitted
PDF Page 66
Answer

it is said on Chapter 2 - page 61 (designer's notes ) that both triangles are similar AND FLIPPED, so the angles shouldn't be flipped too? I agree with my Anonymous friend errata : "The design graphic for the engraving (p. 53) says, "The two mountain triangles are the same shape, but rescaled/flipped." The hint is circled for emphasis on p. 61. The example proceeds as if the triangles were not flipped. The graphics were created as if they were flipped, and the example misses a useful connection to the discussion of similar triangles. In other words, shouldn't the bottom left angle of the larger mountain be 53 degrees rather than 41? The oversight propagates through half the chapter, through p. 76."

Anonymous  Jun 26, 2014 
Printed Page 125
First Colum, Last Row, First Cell in the Table

In the cell you say to add the shortest side squared with the longest side squared. it should be shortest side squared with the middle side squared. Its correct in the solution but wrong in the question.

Arjun  Jan 26, 2011 
Safari Books Online 53
p. 53 ff

The design graphic for the engraving (p. 53) says, "The two mountain triangles are the same shape, but rescaled/flipped." The hint is circled for emphasis on p. 61. The example proceeds as if the triangles were not flipped. The graphics were created as if they were flipped, and the example misses a useful connection to the discussion of similar triangles. In other words, shouldn't the bottom left angle of the larger mountain be 53 degrees rather than 41? The oversight propagates through half the chapter, through p. 76.

Anonymous  Dec 10, 2009