find the diameter of a circle is 9 inches find the area to the nearest 10th

Does the point (1, sqrt 7) lie on circle shown.

Evaluate the expression. (9 + 5)(3 + 2)0

A3-dimensional figure has a square base and 4 lateral faces that meet at a point. explain the difference between the cross sections when a slice is made perpendicular to the base through the vertex, and when a slice is made perpendicular to the base and not through the vertex