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There is a theorem which proves that the interior angles of a triangle add to 180o. It is too difficult to show the proof here, but you can easily make a demonstration: cut a triangle out of paper; make a pencil mark in each corner of the triangle. Cut or tear off each corner, and fit thethreemarked angles together. They should make a straight edge, which is a 180o angle.

Draw a line joining two opposite corners of a rectangle; you have divided it into two triangles. Each of these triangles has angles that add to 180o; together, the six angles of the twotrianglesform the angles of therectangle and must add to 2x180o = 360o.

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Q: Why the triangle is 180 and the rectangle is 360?
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Related questions

Why do the angels of triangle add up to 180 degrees?

Because a triangle is half of a square or rectangle. Since there are 360 degrees in all the angles of a square, there will be 180 degrees in a triangle.


Is the area of a triangle 360?

No; triangle = 180, circle = 360.


Is a sqare 180?

No 360 a triangle is 180


If you add all the angles in a shape which of these shapes would have the smallest sum triangle square rectangle rhombus?

Triangle, since the sum of its angles is 180. The sum of the angles of the square, rectangle, and rhombus are all 360.


Is a triangle and rectangle congruent?

No, a triangle and a rectangle are not congruent. Congruent means exactly the same size and shape. A triangle has 3 sides while a rectangle has four. A triangle's three angles always add up to 180 degrees where as a rectangle's four right angles always equal 360 degrees. They are not congruent- not even similar- at all.


Sum of measures of angles of a triangle to sum or measures or angles of a rectangle?

The sum of the internal angles of any triangle is 180 degrees. Any rectangle has four 90 degree internal angles, totalling 360 degrees.


Do Polygons all have the same angle sum?

Nope ! For example - the sum of the angles in a triangle is 180, while those of a square (or rectangle) are 360.


Why is there 360 degrees in a triangle?

There are 180 degrees in a triangle. Next question?


Prove that sum of exterior angle of a triangle is 360 degree?

because INTERIOR ANGLE 180 AND the exterior angle 180 so 180+180=360


What does the interior angels equal in a triangle?

180 degrees. If you think about it, two triangles when put together make a rectangle/square, which has four right angles (90 degrees), so 90 x 4 = 360 degrees, which is the total interior angles of two triangles, so 360 / 2 = 180 for the interior angles of one triangle.


If 180 degrees is a triangle what is 360 degrees?

360 degrees is either a square or a quadrilateral.


Is a triangle 360 degrees?

No, the internal angles of a triangle add up to 180 degrees