Answer:
A,C,D are triangles, B is not.
Step-by-step explanation:
Let 3 sides of a triangle be a,b,c.
A triangle have the sum of 3 angles = 180 degree
and
a-b<c<a+b (similar for a and b)
a.<u> </u><u>three sides measuring 6 cm, 8 cm, and 10 </u><u>cm</u><u> </u>
Satisfied the a-b<c<a+b property -> triangle
b. <u>three angles measuring 40 degrees, 70 degrees, and 65 </u><u>degrees</u>
<u> </u>Total of 3 angles = 40+70+65 = 175 > 180
-> not triangle
c. <u>three angles measuring 10 degrees, 25 degrees, and 145 degrees</u>
Total of 3 angles = 10+25+145 = 180
-> triangle
d. <u>three sides measuring 9 m, 15 m, and 9 m</u>
Satisfied the a-b<c<a+b property -> triangle
