EPQP's answer to mary's Junior College 1 H2 Maths Singapore question.

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mary
Mary
4 days ago
Thank you
Could you please explain why is it QR tan45° ? As I used R formula and got QR/tan45°
EPQP
EPQP
4 days ago
It depends on which acute angle you're looking at when drawing the associated right angle triangle.

However, since the triangle is a right angle isoc. triangle, it does not matter since both the opposite and adjacent sides will be of equal length.
mary
Mary
4 days ago
ok thank you!