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Oh! Thanks!

Thanks for answering my question!

Thank you Gus! Sadly, I need help again! :( Can someone please show me how to do the following questions? (Thank you!) 1. In triangle ABC, AB = 10 cm, AC = 12 cm and angle A is increasing at the rate of o.1 radian/second. At what rate is: (a) the area of triangleABC increasing, (b) the...

I need help with this question: A ladder AB, 5m long is leaning against a vertical wall with its foot on horizontal ground OB. The foot of the ladder begins to slide along the ground away from the wall at a constant speed of 1 m/s. Find the speed at which the top of the ladder AB is moving...

No. But this exercise comes under cyclic quadrilaterals and concyclic points. Edit: Don't worry. I have the solution. :)

Quick question: x = black dot y = red dot ... but what reason/theorem is it? (Is it 'opposite angles of a cyclic quadrilateral are supplementary'? But is it a cyclic quadrilateral?) Thanks!

Oh... Thanks.

Can I have another clue? I've found more numbers. ( :) )

I'm sorry... I get it now. Thanks.

$In other words, AB is twice the size of OH$ $We have shown that XOHY is rectangular,$ \therefore OX = HY\,\,$(opp. sides of rectangle are equal)$ I understand why AB is twice the size of OH but how does that make XOHY a rectangle?

I overlooked the isosceles triangle AOB. :( Thanks!

Another question: untitled.bmp Thanks!

I'm going to go against my word but that's only because I really need help with Circle Geometry... Anyway: AB and DC are chords of a circle which meet when produced at X. The centre of the circle is O. If angleAOB = 110, angleXBC = 68 and angleXCB = 80, find angleCOD. Thanks!

Hahaha. Next question: Two equal circles intersect in P and Q. A chord APB is drawn through P parallel to the line joining the centres O and H and meeting the circles in A and B. From O and H perpendiculars OX and HY are drawn to AB. a. Prove OH = XY. What is true about OH and AB? b. Prove...

Thanks for coming to my rescue! And yay I get it. :)

I'll try posting here but if I don't get any replies, I'll post a new thread. Well, I have more Circle Geometry questions... :( I'll ask one question at a time so it won't turn you guys off. Two circles are drawn with centres O and H. A line ACDB is drawn perpendicular to OH, cutting the...

Wow! Thanks for contributing! Should I or should I not do the Holocaust though? :( Edit: It's alright. I've made up my mind. Thanks everyone. :)

Yeah... :(

I've only begun learning it and I dislike it already. :(

This is the list suggested on HSC Online: September 11, 2001 2008 Beijing Olympics Tibet War in Iraq Climate Change Fidel Castro and Cuba The Cold War The Holocaust Nelson Mandela Unfortunately, I'm most familiar with the Holocaust... But I'll think about your advice...