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givi [52]
3 years ago
14

Please Help, I will give Brainliest!!!

Mathematics
2 answers:
Fittoniya [83]3 years ago
7 0
Part A: m3 would be 143 degrees by the exterior angle theorem.
Part B: Derrick is incorrect. The base angles would have to be the same by the Converse of the Base Angles Theorem. The angles would have to both be 45 degrees.
STatiana [176]3 years ago
4 0

Answer:

A . 143 degrees

B.  Not isosceles.

Step-by-step explanation:

A.

m < 3 = 90 + m < 1    (by the external angle of triangle theorem)

= 90 + 53

= 143


B. If DEF is an isosceles m < 1 = m <2

and m < 2 = (180 -  143)            (adjacent angles are supplementary).

= 37 degrees but m<1 = 53 degrees so it is not isosceles.

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