Answer:
6) C: 7, 9, 3
7) C: 40°
Explanation:
6)
Follow this rule:
The sum of the smaller to side lengths must be greater than the largest side length
- 5 + 4 < 10 not a triangle
- 5 + 7 < 12 not a triangle
- 7 + 3 > 9 a triangle
- 4 + 5 < 10 not a triangle
The correct answer is C) 7, 9, 3
7)
The sum of angles in a triangle is always 180°
Subtract the other two angles:
- x + 60° + 80° = 180°
- x + 140° = 180°
- x = 40°
The correct answer is C) 40°
-Chetan K