A circle is the set of all points in a plane at a certain distance, its radius, from a certain point, its center. Which of the following words in the definition is an undefined term used in geometry?
O point
radius
center
o distance

Simplify the expression. -2/5(10+15m-20n)

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?

Lucy and donavan measured the length of the school garden. lucys measurement is 11.3m and donavans measurement is 113 cm. could both be correct? explain