Sunday

February 1, 2015

February 1, 2015

Posted by **Heather** on Monday, October 17, 2011 at 9:38am.

A) A line has infinite length.

B) Two intersecting lines divide the plane into four regions.

C) Two perpendicular lines create four right angles.

D)The intersection of two lines creates four angles.

Im realy having trouble on this quesiton & I need some help:) thankyou!

- Algebra -
**Steve**, Monday, October 17, 2011 at 2:42pmThink of great circles on a sphere. Those correspond to straight lines in a plane. An arc of a great circle is the shortest distance between two points, measured along the surface of the sphere. A great circle is one whose diameter is the same as the diameter of the sphere.

not A: On a sphere, a great circle does not have infinite length.

not B: Anything pertaining to a plane has no relevance on a sphere.

not C: Two perpendicular great circles intersect twice. Think of the equator and a meridian. At each intersection there are 4 right angles.

D: This is true. Although as in C, two "lines" on a sphere always intersect twice.

By the way, that means that in spherical geometry, there are**no**parallel lines!

**Answer this Question**

**Related Questions**

Geometry - Which of the following statements from Euclidean geometry is also ...

Geometry - Which statement from Euclidean geometry is also true in spherical ...

Geometry - For each property listed from plane Euclidean geometry, write a ...

Geometry (Checking) - 2.) Which is true about both Pappus's Theorem and ...

Geometry - I dont get these questions Is there exactly one plane containing two ...

geometry - 1.in which geometry do lines no contain an infinite number of points...

geometry - Which of the following statements is true?Select one of the options ...

geometry - Which of the following statements is true?Select one of the options ...

Math - Perry draws two planes, K and L, as shown. Which statement is true? ...

geometry - Trisha drew a pair of line segments starting from a vertex. Which of ...