Edexcel IGCSE Math A 4.2.E polygon angle sums
Practise polygon-angle questions by choosing the correct angle-sum formula, adding known angles and solving for the unknown value.
- Syllabus
- First assessment 2018
- Course
- Math A 4MA1
- Level
- Foundation
Exam points
- Use the interior angle sum of a pentagon, decagon or other polygon to find x.
- Combine exterior-angle information with polygon angle sums to solve for a missing angle.
4.2.E Angle sum of polygons question 1
[Maximum number: 3]
The size of each exterior angle of a regular polygon is 24∘
Work out the value of t.
(5−2)×180=540
540-(90+137+90+128)=95
Final answer:
95∘
M1 for a correct pentagon angle-sum method.
M1 for subtracting the four known angles.
A1.
Alternative exterior-angle method:
90+43+90+52+180-t=360
t=95
All question bank results loaded