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

Please help me answer this problem, sorry I cannot draw the shapes mentioned

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 11:39am
Make 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 1:15pm
Can you tell me how to turn a percentages into a fraction?

- maths -
**Reiny**, Monday, March 16, 2009 at 2:49pm
mIA, 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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