JAMB Mathematics questions: Euclidean geometry

25 questions with answers and explanations. Tap an option to check yourself.

1. Question 21· Euclidean geometry· JAMB

   A chord 8 cm long is 3 cm from the centre of a circle. Find the radius.

   • A11 cm
   • B4 cm
   • C7 cm
   • D5 cm

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   Explanation and discussion

2. Question 22· Euclidean geometry· JAMB

   The vertical angle of an isosceles triangle is 40°. Find each base angle.

   • A50°
   • B40°
   • C140°
   • D70°

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   Explanation and discussion

3. Question 23· Euclidean geometry· JAMB

   An angle at the centre of a circle is 80°. The angle subtended by the same arc at the circumference is:

   • A40°
   • B80°
   • C100°
   • D160°

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4. Question 24· Euclidean geometry· JAMB

   Each exterior angle of a regular polygon is 40°. How many sides has the polygon?

   • A10
   • B8
   • C9
   • D12

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5. Question 25· Euclidean geometry· JAMB

   The sum of the exterior angles of any convex polygon is

   • A720°
   • B180°
   • C540°
   • D360°

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   Explanation and discussion