Plzzz I need help on this question

Is δ pmr similar to δ smn ? if so, which postulate or theorem proves these two triangles are similar?

Which of the following statement about pascal's triangle are true?

Of the ones listed here, the factor that had the greatest impact on the eventual destruction of native americans' ways of life was the development of the a) automobile. b) highway. c) railroad. d) steamboat.