Qualification > Math
IGCSE MATHS Doubts
ivrytwr3:
ok, an equilateral triangle has 3 sides all at 3cm; what is the height and how do you do it?!
Thank You!
gold_wings:
Half the triangle, the base will now be 1.5 cm and the hypotenuse will be 3.
Use Pythagoras' Theorem, your answer should be the square root of 3^2 - 1.5^2
ankitd_1994:
--- Quote from: mdwael on May 15, 2010, 04:44:24 pm ---in May/June paper 4 2009 page 19 d(ii) part (its the last question in the paper) how do you get 1711 and 1770 I got 58 and 59 can someone please explain?
--- End quote ---
the terms would be the 58th and 59th, but the values would be 1711 and 1770 when u substitute the terms in the equation to find the nth term,
n(n+1)/2, so it will be (58*59)/2 and (59*60)/2 which is 1711 and 1770
ivrytwr3:
--- Quote from: gold_wings on May 15, 2010, 05:02:18 pm ---Half the triangle, the base will now be 1.5 cm and the hypotenuse will be 3.
Use Pythagoras' Theorem, your answer should be the square root of 3^2 - 1.5^2
--- End quote ---
thank you, that really helped.
Shazizzzle:
THE BEST revision source! Trust it!: http://thenightdreamer.files.wordpress.com/2010/01/formula_book_20093rd_edition.pdf
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