Free Angles PDF Worksheets & Answers
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Explanation:
Memorise the five core angle facts and their exact wording for “give a reason” questions: (1) Angles on a straight line add up to 180°; (2) Angles around a point add up to 360°; (3) Vertically opposite angles are equal; (4) Angles in a triangle add up to 180°; and (5) Angles in a quadrilateral add up to 360°.
In an isosceles triangle, the two equal sides are marked with tick marks, and the base angles opposite those equal sides are equal.
Example 1: Find the size of angle x on the straight line below.
Example 2: An isosceles triangle has a top angle of 46° between its two equal sides. Find the base angle y.
GCSE Past Paper Angles Questions & Answers
Explain why. [1 mark]
Worked Solution & Mark Scheme (3 marks)
triangle ABE is equilateral
triangle CDE is isosceles, with CE = DE
Worked Solution & Mark Scheme (4 marks)
In isosceles triangle CDE, ∠ EDC = 65°, so ∠ ECD = 65°
Therefore, ∠ DEC = 180° - (65° + 65°) = 50° M1
By symmetry, ∠ AED = ∠ BEC = x
The angles around point E sum to 360°: M1
∠ AEB + ∠ BEC + ∠ DEC + ∠ AED = 360°
60° + x + 50° + x = 360°
2x + 110° = 360° ⇒ 2x = 250° ⇒ x = 125°. A1