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September 20, 2014

September 20, 2014

Posted by **brendon** on Monday, March 16, 2009 at 7:25am.

below

Q. Add one or more lines to make these shapes rigid.

1) square

2) rectangle

3) issoceles

4) pentagon

5) trapezium

6) octagon

Thank you very much.

- maths -
**Damon**, Monday, March 16, 2009 at 11:39amMake them into a bunch of triangles with interior lines. Triangles do not change shape once the length of the three sides is fixed. (side,side,side --->congruent)

For example once you draw one diagonal in a square, it is split into two triangles and will not squish into a parallelogram.

This is not just theory. It is how you build bridges and buildings.

- maths -
**mIA**, Monday, March 16, 2009 at 1:15pmCan you tell me how to turn a percentages into a fraction?

- maths -
**Reiny**, Monday, March 16, 2009 at 2:49pmmIA, don't tag new questions on the end of other problems, start a new post.

percent means per centum or per hundred

so whatever the percentage number is, divide it by 100, then reduce to lowest terms if needed.

e.g.

35% = 35/100 = 7/20

7% = 7/100

12.3% = 12.3/100 = 123/1000

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