What is the simplified answer for 8w = 5

What is the approximate circumference of the circle shown below?

What is the missing reason in step 5? linear pair postulategivendefinition of complementary anglescongruent complements theorem

Thales was an ancient philosopher familiar with similar triangles. one story about him says that he found the height of a pyramid by measuring its shadow and his own shadow at the same time. if the person is 5-ft tall, what is the height of the pyramid in the drawing?