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primary 5 | Maths | Angles & Geometry
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Ricky
Ricky

primary 5 chevron_right Maths chevron_right Angles & Geometry chevron_right Singapore

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Date Posted: 3 months ago
Views: 72
snell
Snell
3 months ago
triangle ADE = 0.5 x AG x AE
= 0.5 x AG x 30
= 15 x AG

triangle ADE = 0.5 x AD x DC
= 0.5 x 24 x 24 = 288


15 x AG = 288
AG = 19.2 cm

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AC Lim
Ac Lim's answer
3270 answers (A Helpful Person)
1st
Hope this helps
Ricky
Ricky
3 months ago
Area ADE should be 1/2 X AD X DE and not 1/2 X AD X DC.
AC Lim
AC Lim
3 months ago
Is 1/2 x AD x dotted line (90 deg with AD )
Dotted line = DC = 24 since it is square.
(Triangle Area = 1/2 x base x height. Base and height should be perpendicular, 90deg) Hope this clear your doubts.
AC Lim
AC Lim
3 months ago
At the same time, area ADE also = 1/2 x AE x yellow line (perpendicular height)
Yellow line = AG. Where you can find Length AG.
Eric Nicholas K
Eric Nicholas K
3 months ago
Ricky, area of a triangle is

1/2 x base x perpendicular height

Note the word “perpendicular”. That is, the height chosen must be at right angles (90 degrees) to your chosen base. Lengths DE and AD are not at 90 degrees to each other considering that ABCD is a square.

So it is obviously not 1/2 x AD x DE.

AC Lim’s workings are fully correct.
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Oh Hui Zhen
Oh Hui Zhen's answer
7 answers (Tutor Details)
The answer is right but maybe you can understand the question better in this way! (: