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primary 6 | Maths
| Fractions
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Date Posted: 4 years ago
Views: 296
Realise that if you add the other 2 angles in the triangle with angle a and angle b,you'll get the angle sum of 2 lines.
Sum of the other 2 angles in the triangle = 180° - 68° = 112°
(Side note : realise the outside angle equals the sum of the 2 angles. This property is known as
'exterior angle = sum of 2 interior opposite angles')
So 112° + ∠ a + ∠ b = 2 x 180°
112° + ∠ a + ∠ b = 360°
So ∠ a + ∠ b = 360° - 112° = 248°
Sum of the other 2 angles in the triangle = 180° - 68° = 112°
(Side note : realise the outside angle equals the sum of the 2 angles. This property is known as
'exterior angle = sum of 2 interior opposite angles')
So 112° + ∠ a + ∠ b = 2 x 180°
112° + ∠ a + ∠ b = 360°
So ∠ a + ∠ b = 360° - 112° = 248°
Yes I got it. Thanks so much!
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