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primary 6 | Maths
| Geometry
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Teacher is there any easy simple steps to find angle a and b?
Date Posted: 4 years ago
Views: 238
Yes.
Can teach me please ?
First, look at the middle downward pointing triangle.
Remaining unknown angle inside that triangle
= 180° - 35° - 36°
= 109°
= 180° - 35° - 36°
= 109°
Until here understand
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°
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°
Ok I following
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
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
There are actually at least 2 more ways to do this question
Sorry teacher I still trying it’s confusing
Ok I'll provide the diagram
Sorry teacher to disturb you so late
If I don’t reply I’m sorry I need to sleep bcos I need go school tomorrow morning
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Date Posted:
4 years ago
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