Answer:
Step-by-step explanation:
1)
- 5² + 12² = 13²
- 25 + 144 = 169
- 169 = 169
- <u>Yes</u>
2)
- 5² + 7² = 9²
- 25 + 49 = 81
- 74 ≠ 81
- <u>No</u>
3)
- 10 + 12 < 30, there is <u>no</u> possible triangle with given sides as per triangle inequality theorem
Your answer will be 3rd one
Answer: 40 degrees
Step-by-step explanation:
180-140=40
A guy named insidious deleted my answer.