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secondary 3 | E Maths
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Annela
Annela

secondary 3 chevron_right E Maths chevron_right Singapore

Can help me with qn 8 (ii) thank you

Date Posted: 4 years ago
Views: 372

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Jun Tat
Jun Tat's answer
7 answers (A Helpful Person)
1st
Hope this helps. Your diagram seems to have most of the sides. Probably just missing the cosine rule
Annela
Annela
4 years ago
Hi can you tell me how to find GX?
Eric Nicholas K
Eric Nicholas K
4 years ago
Hi Annela! GX can be found by considering right-angled triangle CXG (though we can't view it clearly from this view, so we must draw out the triangle ourselves or imagine the view from the right side of the cuboid) where the right angle is at C.

So,

(GX)^2
= (CX)^2 + (CG)^2
= 80 + (7^2)
= 129