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Give me a question. I have no idea what your talking about.

arc length = (theta/360) x 2 x pi x r Therefore: theta = (arc length x 360) / (2 x pi x r) = 69 degrees.

Q 25 (a) (i) (1) Similar figures = ACB, AED (2) Enlargement factor = AC/AE = 200/50 = 4 (3) CB = 20 x 4 = 80 cm Trig. is my bitch.

What did he mean by period payments and lump sum amounts? Example?

If that's the case, then we need to know log rules. Seeing as though this is General Maths, we're most likely doing something wrong. :D

Because you're using the compound interest formula to calculate monthly repayments; use the present value formula for annuities. Don't ask me why. Maybe PC can tell us?

$25,678.92 ?

Yeah, use the future value formula and sub in these values. M = 150 r = 0.068/12 = .0056.... n = 10 x 12 = 120 A = ?

Or it could be because the monthly repayment is $163.75

37 months. Must have rounded.

Got another one: This is from the CSSA 2003 paper. Connie wants to travel overseas and so takes out a loan of $8 000 from a bank. She wants to repay it with monthly instalments over 5 years. The interest rate of the loan is 8.4% p.a. compounded monthly. (i) Calculate what Connie's...

Cheers, mate.

Sorry mate, but I'm not 100% on what you mean by 'angular distance'. Explanation please?

Is the angular distance in Question 6 (a) (iii) 140 - 50 = 90 degrees? Or is the angular distance only for great circles? I.e North - South? Just to confirm, great circles are only longitude, except for the equator? Excellent explanation. Thanks alot.

One more thing. How is Question 6 (a) (ii) different from Question 6 (a) (iii)? Arn't they asking for the same thing?

This relates to the 2005 Success One HSC book. M7: Spherical Geometry. Question 6 (a) (iii) Find the distance between Tokyo and Teheran along the parallel of latitude. Now, I know how to do that question, but what I'm confused about is: why can't I apply the same formula to calculate...

I hate this topic. How do you do this? Calculate the monthly loan repayment for a loan of $200 000 at 8.4% p.a for 15 years. Cheers.

Someone else wanna do cosine?

The other application of sine rule is to find angles. In this case the question will give you 2 sides and an angle. Rearrange the formula like so: sine A/a = sine B/b Now substitute into the formula. E.g, you're asked to find the missing angle with the following data. 2 sides...

Eeeerrrr, I think I'll give it a try with words. Both are used when your trying to find either a side or an angle, but the difference is what the question gives you. For sine rule, you'll be given either 2 angles and one side - so, you use: a/sine A = b/sine B E.g: You have a...