Area Problem

a cow is tied to a 50 ft. rope attached to the side of a barn 10 ft. from a corner. The Barn is a rectangle 20ft. by 40ft. What is the total grazing area for the cow? An exact ans.

Finite Axiomatic Geometry This abstract geometry confuses me and I just can't follow this logic. Here is a set up of the question. Please help with some insight. Consider the following axiom system. The undefined terms are point, line, and on. Definition: two lines are parallel if there is no point on both of them. Axioms: I. Given any two distinct points, there exactly one line on both of them. II. Every line has at least one point on it. III. Given any line, there is at least one other line that is parallel to it. IV. There exists at least one line. [The book defines each axiom an "undefined term" called a "interpretation of a system."] [If, for a given interpretation of a system, all the axioms are "correct" statements, we call the interpretation a "MODEL"] Questions: (a) Show that this axiom system is consistent by finding a model for it. (b) Using models, show that Axiom III is independent of the other axioms. (c) Show that this axiom system is not complete.

Geometry Finite Axiomatic Geometry Finite Axiomatic Geometry This abstract geometry confuses me and I just can't follow this logic. Here is a set up of the question. Please help with some insight. Consider the following axiom system. The undefined terms are point, line, and on. Definition: two lines are parallel if there is no point on both of them. Axioms: I. Given any two distinct points, there exactly one line on both of them. II. Every line has at least one... click for more

Finite Axiomatic Geometry

I just can't follow the abstract logic on this. Here is a set up of the question. Consider the following axiom system. The undefined terms are point, line, and on. Axioms: I. Given any two distinct points, there exactly one line on both of them. II. Given any line, there is at least one point not on it. III. Given any line, there are at least five points on it. IV. There is at least one line. Question: (a) Prove that there are at least six lines. (b) Prove that there are at least 21 points.

Area of square inscribing a circle.

The area of a circle which is inscribed in a square is 169pi. What is the area of the square?

the arc of the sector

A circle of radius 9 has a sector which has an area of 18 pie. How many degrees are there in the arc of that sector?