Find the perimeter of a triangle where one side is 3 cm., one side is 9 cm. And one side is 12 cm.?

Question

a) 12cm
b) 6 cm
c) 4 cm
d) 24 cm

Answer 1

24. The perimeter is just the sum of all the sides

Answer 2

Actually, none of those answers is really correct, because this isn't a triangle. The lengths of the two shorter sides of a triangle have to have a sum that is greater than the length of the longest side.

This "triangle" is really a line segment, because the two shorter sides are equal to the length of the longest side. So the best answer is 12 cm. But that's not really the perimeter. It's just the length of the line segment that corresponds to the longest side.

Sorry! That's what you should tell whoever asked you this problem.

EDIT:

Let me see if I can draw a text picture:

Let the "sides" having length 3, 9, and 12 be AB, AC, and BC respectively.

B - - - A - - - - - - - - - C

Because AB + AC = BC, AB and AC lay flat on the "side" BC. So it's just a line segment.

Answer 3

Perimeter = 3+9+12=24cm Ans.

Answer 4

The Perimeter

3 + 9 + 12 = 24 cm

The perimeter is 24 cm

- - - - - - - -s-

Answer 5

in accordance on your information, the fringe is the sum of length of all aspects. So, the fringe is Perimeter=(2x + 9) + (2x + 9) + (3x) because the fringe is wisely-known to be 60 inches, 60 = (2x + 9) + (2x + 9) + (3x) or, 60 = 2(2x + 9) + 3x = 4x + 18 + 3x = 7x + 18 60 - 18 = 7x 40 2 = 7x 40 2/7=x x=6 for this reason, x = 6

Answer 6

I'm afraid, your figures cannot form a triangle, but only a straight line, as 3+9 = 12, the third side of 12 will never be found

Answer 7

Unfortunately this is not a triangle

as sum of 2 sides = 3rd side (3+9 = 12)

Answer 8

d

9+3+12=24

Answer 9

24 is the answer they're looking for but the above answer is correct that these mesurements won't make a completed triangle.

Answer 10

D)24 just add them all up