Question

Two sides of a triangle measure 15cm and 21cm. Which of the following could be the measure of the third side?
A. 4 cm
B. 5 cm
C. 6 cm
D. 7 cm

I WILL FAN AND MEDAL

Answer 1

a and b

Answer 2

with these details every 4 choices can being right

Answer 3

Basically if you have 2 sides of a triangle, the minimum distance of the third side must be at least 6 cm. (21cm - 15 cm = 6cm)
If the third side equals 6 cm then the 3 lines would just overlap so I'd so the only answer is
D
And there's a triangle tester here: http://www.1728.org/trianinq.htm

Answer 4

Must be less than: 15 + 21
Must be greater than 21 - 15

You tell me why.

Answer 5

Answer is d.,,,,sum of any two sides must be greater the third remaining

Answer 6

i dont understand

Answer 7

Answer is d.,,,,sum of any two sides must be greater the third remaining

Answer 8

21+15>7,15+7>21,21+7>15,,,,all the above except d are not fulfiling it,,,property of inequality

Answer 9

21+15>7,15+7>21,21+7>15,,,,all the above except d are not fulfiling it,,,property of inequality

Answer 10

okay......................

Answer 11

I'd strongly recommend that you, Sam, sketch this situation.

Draw a line 21 cm long. Draw another line 15 cm long. At first, make the 2nd line parallel to the first. What is the shortest possible that the 3rd side could be?
What is the longest that the 3rd side could be? Why?

Once again: sketch a 21 cm line first. Play with the 15 cm line, keeping one of its ends always touching one end of the 21 cm line.

Answer 12

Much of what the others have suggested will become clearer if you'd sketch this situation.

Answer 13

well i cant because it is a question and it has no picture attached to it..

Answer 14

Basically when you know two sides
The third side must be less than the sum of the other 2 sides.
The third side must be longer than the difference of the other 2 sides.

Answer 15

Sam, just grab a real piece of paper and a real pencil and start drawing. I didn't say a picture was attached; rather, I'm asking you to create your own picture.

See what wolf and tkhunny have advised.

Answer 16

thanks for evreyones help...but i have to go..im really sorry!!!!!!! :(

Answer 17

Well here's a picture