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primary 5 | Maths | Angles & Geometry
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Vivi
Vivi

primary 5 chevron_right Maths chevron_right Angles & Geometry chevron_right Singapore

Kindly help

Date Posted: 1 month ago
Views: 30
J
J
1 month ago
CF = FE. So △CFE is isosceles.

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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Ho Jian Hian
Ho Jian Hian's answer
4 answers (Tutor Details)
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Vivi
Vivi
1 month ago
Thank you so much your explaination is very details n understandabe.
Vivi
Vivi
1 month ago
Thank you so much your explaination is so details n understandable