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Mathematics 21 Online
OpenStudy (anonymous):

Am I right? Please check.

OpenStudy (anonymous):

OpenStudy (anonymous):

@Luis_Rivera is my answer right?

OpenStudy (raden):

i think it is 130 degrees

OpenStudy (anonymous):

why?

OpenStudy (raden):

because mGF = mHE (opposite angles)

OpenStudy (raden):

while to get mHE = mDE + mDH = 40 + 90 =130

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