AQA · Mathematics · 8300
GCSE Maths: Angles: vertically opposites
Geometry & Measures · AQA GCSE Maths (8300). Cards are generated from the Corbettmaths practice questions for Angles: vertically opposites (Corbettmaths Video 39), and every card links back to the exact page it came from. Practice tests are drawn from this deck’s own cards. Source material © Corbettmaths — used with attribution.
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What is the sum of the interior angles of a quadrilateral?
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360°
What is the sum of the interior angles of a triangle?
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180°
In a parallelogram, what is the relationship between opposite angles?
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Opposite angles are equal.
In an isosceles triangle, which angles are equal?
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The two base angles (angles opposite the equal sides) are equal.
What is a reflex angle?
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An angle greater than 180° but less than 360°.
Can a triangle contain a reflex angle?
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No, because the sum of angles in a triangle is 180°, and a reflex angle alone exceeds 180°.
Can a triangle contain two obtuse angles?
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No, because two obtuse angles (each >90°) would sum to more than 180°, but all three angles must sum to exactly 180°.
What are vertically opposite angles?
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Angles formed when two lines intersect; they are opposite each other and are equal in size.
What are angles on a straight line?
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Angles on a straight line sum to 180°.
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