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primary 5 | Maths | Angles & Geometry
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Ian
Ian

primary 5 chevron_right Maths chevron_right Angles & Geometry chevron_right Singapore

Please help me understand this question with working steps.. really appreciate

Date Posted: 6 months ago
Views: 83
J
J
6 months ago
Realise that two triangles have the same base length and same height. So their area is the same.
Ian
Ian
6 months ago
May I know the answer for (a) and (b)
J
J
6 months ago
Triangle ABD and BDC have the same height and same base length. The question has already given you the area of one of them. So you can find ABD easily.

As for b) , since EDC is smaller than BDC, the answer for b) has to be smaller than BDC's area.

Post your answers here and I'll let you know if you are correct or not
Ian
Ian
6 months ago
They have same base but height is different. May I know why the height is the same?
J
J
6 months ago
It is clearly stated in the question that BC is the height of triangles BDC and ABD
Ian
Ian
6 months ago
Omg you are right!
J
J
6 months ago
So why do you say the height is different? Did you mistake the slant height for the vertical height?
Ian
Ian
6 months ago
Yes and most importantly i didn’t read the question properly
Ian
Ian
6 months ago
Sorry. How do I know what is the length of the base or height?
J
J
6 months ago
If they have the same height and base length then their area is the ___?

So area of triangle BDC is 8cm² , then area of triangle ABD is __?

Is it necessary to know the height and base length to solve the question?
Ian
Ian
6 months ago
Ok got it