The mistake is she uses 7² + 25² = 24² when the actual equation should be 7² + 24² = 25² which would be correct 7² = 49 / 24² = 576 / 49 + 576 = 625 which is equal to 25²
The mess up occurs in one of the first things she says. She first claims that 7^2 +25^2 = 24^2 Wait a minute... slow your roll there. 25 is the hypotenuse, or the longest side of the triangle AND opposite the right angle (but we aren't supposed to know that yet). The Pythagorean Theorem holds that a^2 + b^2 = c^2, where a & b are the legs of the triangle & c is the hypotenuse. So, she got the formatting correctly, but she switched 24 & 25. Hope this helps!
Dilations preserve angle measures, regardless of the scale factor. Therefore, the angle measures of the image will be the same of that of the pre-image, so our answer is still 45 °, 55 °, and 80 °.
