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Mathematics 29 Online
OpenStudy (anonymous):

What is the order of the side lengths of triangle ABC from largest to smallest? b, a, c b, c, a a, b, c a, c, b

OpenStudy (anonymous):

OpenStudy (foolaroundmath):

Hint: The side opposite to an angle of higher magnitude is longer.

OpenStudy (anonymous):

is it abc?

OpenStudy (foolaroundmath):

Yes :)

OpenStudy (anonymous):

Which set of numbers does not create a triangle? 80 cm, 25 cm, 1 m 5 m, 12 m, 8 m 110 ft, 12 yd, 150 ft 7 yd, 13 yd, 19 yd

OpenStudy (foolaroundmath):

For this, use the fact that the sum of any two sides of a triangle MUST be greater than the third side.

OpenStudy (anonymous):

so lets say i add 80+25?

OpenStudy (foolaroundmath):

Then you get 105 cm which is greater than 1m (= 100cm). So, this is a triangle. The trick is to just check whether the sum of the smaller two sides is greater than the third side.

OpenStudy (anonymous):

yes but for the first one anf third one i get a bigger number than the third side

OpenStudy (foolaroundmath):

You should be getting it to be bigger than the third side. If the sum is smaller, it can never be a triangle. (By the way, if you check for the third one, 110ft + 12yd < 150ft). It's the third one that cannot be a triangle

OpenStudy (anonymous):

so is it the last one or the first one?

OpenStudy (foolaroundmath):

It's the third one (110ft + 12yd = 110ft + 36ft = 146ft < 150ft) So the third one cannot be a triangle

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