challenging to all brainly challenger or master solve c part
Answers
The rule to test if 3 lines can be a triangle:
The sum of the lengths of any two sides of a triangle must be greater than the length of the third side.
------------------------------------------------------------------------------------------
(a) The length are 6cm , 8 cm and 7 cm
6 + 8 = 14 > 7
6 + 7 = 13 > 8
7 + 8 = 15 > 6
Conclusion: This is a triangle
------------------------------------------------------------------------------------------
(b) The lengths are 10 cm, 20 cm and 7 cm
10 + 20 = 30 > 7
20 + 7 = 27 > 10
7 + 10 = 17 < 20 (This fail the check)
Conclusion: This is not a triangle
------------------------------------------------------------------------------------------
(c) The lengths are 15 cm, 12 cm and 8 cm
15 + 12 = 27 > 8
12 + 8 = 20 > 15
8 + 15 = 23 > 12
Conclusion: This is a triangle
------------------------------------------------------------------------------------------
Answer: Both (a) and (c) are triangles.
------------------------------------------------------------------------------------------