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primary 5 | Maths
| Angles & Geometry
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angle FCE = angle FEC = 23° (base angles of isosceles triangle)
Angle DFE
= 180° - angle FEC - angle FCE - angle CFD
= 180° - 23° - 23° - 62°
= 72°
(angle sum of △CFE)
Since FE = ED, △ DFE is isosceles.
angle DFE = angle FDE = 72°
(Base angles of isosceles triangle)
So, angle a
= 180° - angle DFE - angle FDE - angle FEC
= 180° - 72° - 72° - 23°
= 13°
(angle sum of triangle)
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