Geometry

Lines, angles, triangles, quadrilaterals and circles.

General Test5 questions
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Key facts

  • The angles of a triangle add up to 180°; of a quadrilateral, to 360°.
  • Exterior angle of a triangle = sum of the two opposite interior angles.
  • Pythagoras: in a right triangle, hypotenuse² = sum of the squares of the other two sides.
  • Sum of interior angles of an n-sided polygon = (n − 2) × 180°.
  • The angle in a semicircle is 90°.

Practice questions

Two angles of a triangle are 50° and 60°. The third angle is:Easy
The hypotenuse of a right triangle with legs 6 cm and 8 cm is:Easy
The sum of the interior angles of a hexagon is:Medium
The angle subtended by a diameter at any point on the circle is:Medium
Each interior angle of an equilateral triangle is:Easy
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