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Because the 3 interior angles of any triangle add up to 180 degrees

Q: Why do triangles equal 180 degrees?

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180 degrees, same as all triangles

180 degrees... all triangles equal 180.

never In non-Euclidean geometry triangles can have angles that are more or less than 180 degrees.

No. The sum of the angles in ALL triangles is equal to 180 degrees. No triangle's angles equal 360.

all inner angles are equal to 180 degrees

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180 degrees, same as all triangles

180 degrees... all triangles equal 180.

No, only triangles do.

Yes the 3 interior angles of any triangle add up to 180 degrees

never In non-Euclidean geometry triangles can have angles that are more or less than 180 degrees.

No. The sum of the angles in ALL triangles is equal to 180 degrees. No triangle's angles equal 360.

all inner angles are equal to 180 degrees

All the Angles and sides on Triangles are always going to equal 180 Degrees

Assuming the question was if an isosceles triangle have angles that add up to 180 degrees, then yes. All triangles have angles that add up to 180 degrees.

Yes. Only triangles on a flat plane have angles summing 180°.

A triangle doesn't equal 180, but the sum of the internal angles of every triangle equals 180 degrees.

540 degrees. you figure it out by seeing how many triangles you can make in the polygon (without crossing lines), and, because triangles equal 180 degrees, you multiply 180 times how many triangles you can make.