Qualification > Math
IGCSE MATHS Doubts
The Golden Girl =D:
--- Quote from: A@di on May 05, 2010, 04:32:48 pm ---Ok if u solve it using the sine method. You get 54 degree. However they say its obtuse which means sine x = 0.809 , x =/= 54.
in such situations, u have to use the trigonometric rule sine x = sine 180-x rule to find any other angle whose sine is 0.809
thus, 180-54 = 126. sine 126 = 0.809
Answer : 126 (Obtuse)
--- End quote ---
i didn't know that such a rule "sin =180 - 54" can come in a traingle question.....that's y i didn't even think of this rule ..........thx !!
LM:
Hey Guys...
I have billion of question I don't understand...
Could you please help me?
here are the question...
1. Carla estimates the length of the wall to be 25 m and the height to be 2 m.Paolo tells her that the length is 25 m correct to the nearest 5 m and the height is 5 m correct to the nearest 10 centimetres. Complete the statements below.
(a) ............m ? length of the wall < ...........m
(b) ............m ? height of the wall < ...........m
and everytime this kind of question come up, I never understand hooq to do it....
2.
Snake:
20M=<Length of wall<30M
1.9M=<Height of the wall<5.1M
That should be right
Dark Prince:
hey deres another Qs:
Q- Two men, John and Peter, can paint a house in 10 days. John alone can paint the house in 15 days. How long will Peter take to paint it alone?
Ghost Of Highbury:
10/15 + 10/x = 1
10x + 150
--------- = 1
15x
10x + 150 = 15x
5x = 150
x = 150/5 = 30
30 days.
Im not sure abt this though
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