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primary 6 | Maths | Geometry
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Jane lee
Jane Lee

primary 6 chevron_right Maths chevron_right Geometry chevron_right Singapore

Teacher is there any easy simple steps to find angle a and b?

Date Posted: 4 years ago
Views: 233
J
J
4 years ago
Yes.
Jane lee
Jane Lee
4 years ago
Can teach me please ?
J
J
4 years ago
First, look at the middle downward pointing triangle.
J
J
4 years ago
Remaining unknown angle inside that triangle

= 180° - 35° - 36°
= 109°
Jane lee
Jane Lee
4 years ago
Until here understand
J
J
4 years ago
Now look at the small triangle on the right (the one with the 42°)

Now in this triangle,

109° = 42° + the upper unknown angle
(Exterior angle = sum of 2 interior opposite angles)

So the unknown angle = 109° - 42° = 67°
Jane lee
Jane Lee
4 years ago
Ok I following
J
J
4 years ago
Now,

This angle 67° is equal to the sum of angle a and angle b

(Property : exterior angle = sum of 2 interior opposite angles)

The triangle we are looking at here is the big narrow triangle that contains both a and b.

Notice that this 67° is an exterior angle of it
J
J
4 years ago
There are actually at least 2 more ways to do this question
Jane lee
Jane Lee
4 years ago
Sorry teacher I still trying it’s confusing
J
J
4 years ago
Ok I'll provide the diagram
Jane lee
Jane Lee
4 years ago
Sorry teacher to disturb you so late
Jane lee
Jane Lee
4 years ago
If I don’t reply I’m sorry I need to sleep bcos I need go school tomorrow morning
J
J
4 years ago
Check the answer, just uploaded

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J
J's answer
1022 answers (A Helpful Person)
1st
Any question please ask
Jane lee
Jane Lee
4 years ago
TQ
Jane lee
Jane Lee
4 years ago
TQ
J
J
4 years ago
Welcome
Jane lee
Jane Lee
4 years ago
TQ teacher for teacher me