J's answer to Abbas's Primary 6 Maths Geometry Singapore question.
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∠a + ∠b = 67°
(exterior angle = sum of two interior opposite angles)
Or
∠a + ∠b = 180° - 113° = 67°
(Angle sum of triangle)
(exterior angle = sum of two interior opposite angles)
Or
∠a + ∠b = 180° - 113° = 67°
(Angle sum of triangle)
Date Posted:
4 years ago
Abbas, you're on the right track. Just have to find the other angles first using the properties :
①Vertically opposite angles are equal
②angle sum of triangle = 180°
①Vertically opposite angles are equal
②angle sum of triangle = 180°
Thanks it is so useful. Thanks J
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