The proposition "the sum of the internal angles of a triangle is equal to 180 degrees" is () A. False proposition B. definition C. theorem D. axiom

The proposition "the sum of the internal angles of a triangle is equal to 180 degrees" is a theorem

RELATED INFORMATIONS

1. The proposition "the sum of the internal angles of a triangle is equal to 180 degrees" is rewritten as "if"______ So______ ．
2. For your help, I want to prove that "the sum of the internal angles of a triangle is 180 degrees." Please see my webpage. It's a proof of using a triangle with auxiliary lines to find the sum of internal angles
3. How much is 5 / 14 times 3.5 plus 3 / 4 divided by 16.2?
4. What is three times eight? Equal to what?
5. Two fifths times what equals eight
6. 45 degrees 52 minutes 48 seconds=_ 31 degrees, 126=_ Degree_ Points_ 180 degrees - 56 degrees 52 minutes 48 seconds=_ 54 divided by 3=_
7. 38 degrees, 31 minutes, 21 seconds divided by 3?
8. 38 degrees 40 seconds divided by 3
9. How many degrees is 12 degrees and 9 minutes?
10. Calculation: 125 degrees 12 points - 36 degrees 48 points 18.3 degrees + 33.34 degrees
11. Is it possible that the sum of internal angles of a triangle is not equal to 180 degrees? Please leave a diagram
12. Verification: the sum of the internal angles of a triangle is equal to 180 ° and there must be a process of graph writing, verification and proof
13. As shown in the figure, the sum of the five internal angles of the pentagram ABCDE is ∠ a + ∠ B + ∠ C + ∠ D + ∠ E=______ Degree
14. As shown in the figure, the internal angles of the Pentagon ABCDE are equal, and angle 1 equals angle 2, and angle 3 equals angle 4. Find the value of X sandwiched between angle 1 and angle 3 Given that every internal angle of a polygon is equal, and an internal angle is equal to 9 times of its adjacent external angle, find the number of sides of the polygon
15. Greater than or equal to 180 degrees is called sector If the answer is wrong, aha
16. A straight line passes through point a (2, - 3), and its inclination angle is equal to twice the inclination angle of the straight line √ 3 / 3x + 1. Try to find the oblique and oblique section of the straight line
17. If the angles formed by three coplanar vectors a, B and C are equal, and ㄧ a ㄧ = 1, ㄧ B ㄧ = 2, and ㄧ C ㄧ = 3, then ㄧ a + B + C ㄧ = 3
18. What's 61 degrees and 30 minutes
19. How many degrees is 112 degrees and 30 minutes?
20. What's 190 degrees and 30 minutes