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Question
primary 6 | Maths
| Geometry
One Answer Below
Anyone can contribute an answer, even non-tutors.
Pls help. Thanks!!
Date Posted: 4 years ago
Views: 236
Another way :
The three corner triangles have an angle sum of 180° x 3 = 540°
Now we take away the 3 unlabelled angles (one per corner triangle) to get our sum of ∠ a to ∠ f.
But notice that these 3 unlabelled angles are the angles of the big triangle, so their sum is 180°.
So sum of ∠a to ∠f = 540° - 170° = 360°
The three corner triangles have an angle sum of 180° x 3 = 540°
Now we take away the 3 unlabelled angles (one per corner triangle) to get our sum of ∠ a to ∠ f.
But notice that these 3 unlabelled angles are the angles of the big triangle, so their sum is 180°.
So sum of ∠a to ∠f = 540° - 170° = 360°
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This is another method that i used for these type of questions.
Date Posted:
4 years ago
This is the correct reasoning
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