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secondary 4 | E Maths
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For qn 7, why i cannot use this volume of cone formula and why do i have to use similar figures
For qn 10, why angle coa and angle cba are not opposite segments? And instead angle cda and angle cba are opposite segments?
Thank you
Date Posted: 5 years ago
Views: 266
Good morning Annela!
Using similar figures would be more appropriate because both the heights and radii of the two related cones are unknown, but they are related. Using volume of cone is possible but will eventually reduce into the similarity statement.
Will look at the rest later.
Using similar figures would be more appropriate because both the heights and radii of the two related cones are unknown, but they are related. Using volume of cone is possible but will eventually reduce into the similarity statement.
Will look at the rest later.
Good afternoon Annela!
If you draw the line from C to A, you will realise that triangle COA and triangle CDA are on the same side of the chord CA, so these are considered to be in the “same segment”. Whereas triangle CBA is on the other side and is in the “opposite segment” as triangle CDA in the cyclic quadrilateral.
When we use the cyclic quadrilateral rule (i.e. opposite segments rule), we must Ensure that the angles which we use must ALL touch the circumference of the circle; O is not on the circumference so we cannot use COA and CBA.
If you draw the line from C to A, you will realise that triangle COA and triangle CDA are on the same side of the chord CA, so these are considered to be in the “same segment”. Whereas triangle CBA is on the other side and is in the “opposite segment” as triangle CDA in the cyclic quadrilateral.
When we use the cyclic quadrilateral rule (i.e. opposite segments rule), we must Ensure that the angles which we use must ALL touch the circumference of the circle; O is not on the circumference so we cannot use COA and CBA.
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Good evening Annela! Here are my workings for Q7.
Date Posted:
5 years ago
done
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Good evening Annela! Here are my workings for this question.
Date Posted:
5 years ago
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