How many different triangles can be constructed so that the lengths of the three sides are x cm , 2x cm and 12cm, where x is an integer?
A. 5
B. 7
C. 9
D. 11
Sides of triangle
2009-04-17 6:56 am
回答 (1)
2009-04-17 7:02 am
✔ 最佳答案
considerx+2x>12
x>4
x+12>2x
x<12
so 12>x>4
x can be 5,6,7,8,9,10,11 cm
B.7traingles can be constructed
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