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denis-greek [22]
3 years ago
10

PLEASE HELP WILL MARK BRAINLIST

Mathematics
1 answer:
Gelneren [198K]3 years ago
3 0

Answer:

23

Step-by-step explanation: i took it

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Answer:

\triangle EDF is isosceles.

Step-by-step explanation:

Please have a look at the attached figure.

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<u>Property of external angle:</u> External angle in a triangle is equal to the sum of two opposite internal angles of a triangle.

i.e. external \angle DFG = \angle E + \angle EDF

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Comparing equations (1) and (2):

It can be clearly seen that:

\angle DFE = \angle E =90-\dfrac{y}{2}

The two angles of \triangle EDF are equal hence \triangle EDF is isosceles.

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