PSLE - New Format for Maths

[CrazyDad]

I think any number between 90 degree and 179 degree will be considered correct. By drawing a semi circle, draw any two lines from the centre of the circle to the edge of the circle. Then draw another line right in the middle of the two. Any diagram drawn under the above condition fits the question, unless something is missing. So I believe fee point will be awarded to all students.



or just day dreaming :idea:

[Joy]

I also think so cos the info is inadequate.

CrazyDad:

I think any number between 90 degree and 179 degree will be considered correct. By drawing a semi circle, draw any two lines from the centre of the circle to the edge of the circle. Then draw another line right in the middle of the two. Any diagram drawn under the above condition fits the question, unless something is missing. So I believe fee point will be awarded to all students.


or just day dreaming :idea:

[turquoise]

The answer is 150 deg. The easiest way to get the answer is via the equilateral triangle and isosceles triangle method. Several posters have already shown how to derive the answer.


If still in doubt, draw the figure on a piece of paper, making sure you have a square, and the three lines are of the same length. Measure the angle. It’s 150 deg.

[chochipkooky]

Does anyone know whether it was clearly shown that the 4 sides were of equal length thus making it a square? If not, I agree with CrazyDad. Information inadequate.

[turquoise]

chochipkooky:

Does anyone know whether it was clearly shown that the 4 sides were of equal length thus making it a square? If not, I agree with CrazyDad. Information inadequate.

It's stated in the question.

[James Ang]

chochipkooky:

Does anyone know whether it was clearly shown that the 4 sides were of equal length thus making it a square? If not, I agree with CrazyDad. Information inadequate.

Yes, it is a square and the information is provided that it is a square as my students have told me. That means all the 3 equal lines are the radii of the arc (incomplete circle) and that makes all the 3 lines (length of square) and all the 3 radii equal and thus the equilateral triangle.

[chochipkooky]

Ok, then. 150 degrees should be the right answer. My son got it wrong.

[justsay]

http://www.postimage.org/



Is this the exact drawing appear in the question paper ? My daughter remembered the middle line appeared to be dotted and she and her classmate said that they were quite sure there wasn't a '-' in the middle to show that those are isoceles triangles ? :?

[lovingmum]

don’t worry parents. though they get the answer wrong (including my daughter), i am sure some marks can be accorded if there are some correct workings here and there. may end up getting half mark or 1 mark. Aim is to have clear workings and ability to show examiners you know how to apply your concepts etc so sometimes not getting the answers does not mean getting a "0" for the questions. For those with higher mother tongue, 2 more papers to go! All the best and press on. for those without higher mother tongue, can see the light at the end of tunnel already. just give it all you have and enjoy from 10 am onwards on monday.

[Ultra KS]

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