The outer angle of a triangle is equal to the sum of its two inner angles

| March 7, 2021 | education

1. The outer angle of a triangle is equal to the sum of its two inner angles 2. Through any point of the plane you can draw a straight line. 3. Through any two points of the plane you can draw a straight line 4. Through any three different points of the plane you can draw a straight line 5. The sum of vertical angles is 180 ° 6. Sum of two adjacent angles is 180 ° 7. If the angle is 54 °, then the vertical angle with it is 34 ° 8. If two parallel straight lines are intersected by a third straight line, then the corresponding angles are equal. 9. If two perpendicular straight lines are intersected by a third straight line, then the sum of the inner one-sided angles is is equal to 180 ° 10. If two lines are perpendicular to the third line, then these two lines are perpendicular. 11 If the two angles of a triangle are 36 ° and 64 °, then the third angle is 100 ° 12. If one of the angles of an isosceles triangle is 30 °, the other is equal to 120 °

1 Not true, the outer angle is equal to the sum of two angles that are not adjacent to it.
2 Correct.
3 Correct.
4 Not true.
5 Not true. The vertical angles are equal.
6 Correct.
7 Not true, it is 54 °.
8 Correct.
9 Correct.
10 Not true, they are parallel.
11 Not true, it is 80.
12 Right, the angle against the base is 120.



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