Help me with number 7 please

The reflexive property of congruence lets you say that ∠pqr ≅

9.4.34  question   to estimate the height of a stone  figure, an observer holds a small square up to her eyes and walks backward from the figure. she stops when the bottom of the figure aligns with the bottom edge of the  square, and when the top of the figure aligns with the top edge of the square. her eye level is 1.811.81 m from the ground. she is 3.703.70 m from the figure. what is the height of the figure to the nearest hundredth of a  meter?

240 seventh graders and two-thirds of the students participate in after-school activities how many students participate in after-school activities