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secondary 4 | E Maths
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Ashley
Ashley

secondary 4 chevron_right E Maths

How to find value of z

Date Posted: 6 years ago
Views: 351
Tham Tian Ching Janice
Tham Tian Ching Janice
6 years ago
angle DBC + angle ABD = 180^
angle DBC = 180 - 40 = 140^
angle y = 180 - 140 - 15 = 25^

angle ADC = angle BCD = 70 + 25 = 95^
angle z = 95degree

If angle y = 20degree,
Triangle ACD do not add up to 180degree therefore angle y = 25degree
Ashley
Ashley
6 years ago
How do u manage to find the value of y just by knowing triangle ACD is not 180? And how do u know it is not 180?

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May Min
May Min's answer
24 answers (Tutor Details)
1st
Notice that ad and ce are parallel, hence z = x + y