Question

If I make a triangle with two 90 degrees angles in a spherical body, is it still a triangle?

Answer 1

triangles aren't spheres

Answer 2

I know they aren't spheres, but what if i draw one on a sphere. I'm sorry if i didnt explain myself well, english isnt my first language

Answer 3

Than it would be a triangle on top of a sphere.

Answer 4

I'm going to go with not a triangle. a triangle is a 2 dimensional shape that is defined as having three non-zero angles that add up to 180 degrees. you can't make it have three dimensions.

Answer 5

a triangle can't have two 90 degrees angles...

Answer 6

traingles dont have two right angles

Answer 7

If you draw it on a sphere, the sides would not be straight line segments but curved lines...

Answer 8

Then if we draw a straight line on the floor, wouldn't it be curved too because the curvature of the earth?

Answer 9

hahahahaha... that was amazing...

Answer 10

In spherical geometry, you can have a spherical triangle with two right angles. This is impossible in euclidean geometry, but easily done in spherical geometry.

Answer 11

oh spherical traingle

Answer 12

Pictures are worth a thousand words....
(just took a class on spherical/hyperbolic/"Taxi Cab" geometry so this is fresh on my mind)

Answer 13

btw, ive gone through so much paper posting picture on this site <.< im destroying rain forests >.< its like im the bad guy from the movie Fern Gully >.>

Answer 14

me too lol
i tried to save paper and right on the back too

Answer 15

it's not a triangle.... because a triangle must has 3 angles.. the sum of 3 angles is 180.. so 90+90=180 (it just 2 angles)... it cant a triangle... a triangle only have 1 right angle...

Answer 16

in spherical geometry the sum of the angles can be bigger than 180. You cant treat spherical like euclidean. All the formulas are different, units are different, etc.

Answer 17

http://en.wikipedia.org/wiki/Spherical_geometry

Answer 18

a triangle is a polygon and polygons do not have curved sideand no triangle can have more than one right angle

Answer 19

The poster is talking about a triangle on a sphere, so we are talking about spherical triangles here, not "normal" (Euclidean) triangles. Yes, it is true that "normal" triangles cant have more than 2 right angles. Spherical triangles can. Look at the picture in the wiki article, read the caption under it. Look at the picture I drew. Its all there.

Answer 20

thank u joemath, that clears my doubt :D