Chọn đáp án sai: Hình chiếu trục đo xiên góc cân có P = r = 1, q = 0,5

A. P = r = 1, q = 0,5

B. $\widehat{X\text{'}O\text{'}Z\text{'}} = \widehat{X\text{'}O\text{'}Y\text{'}} = \widehat{Y\text{'}O\text{'}Z\text{'}} = 120°$

C. $\widehat{\mathrm{X}\text{'}\mathrm{O}\text{'}\mathrm{Y}\text{'}} = 90°$

D. $\widehat{\mathrm{X}\text{'}\mathrm{O}\text{'}\mathrm{Y}\text{'}} = \widehat{\mathrm{Y}\text{'}\mathrm{O}\text{'}\mathrm{Z}\text{'}} = 135°$