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secondary 4 | A Maths
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chubbun
Chubbun

secondary 4 chevron_right A Maths chevron_right Singapore

hi! please help me to solve this question! thank you :)

Date Posted: 3 months ago
Views: 27
Eric Nicholas K
Eric Nicholas K
3 months ago
We call XAB x degrees.
YAB 80 - x degrees.

For circle 1, XT is tangent

By alternate segment theorem, YXT = XAB = x.

For circle 2, YT is tangent

By alternate segment theorem, XYT = YAB = 80 - x.

So YXT and XYT combined is 80 degrees.

So XTY is 100 degrees.