justification of angle 90 degree right angle triangle
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Take a strait road and calculate what is the degrre of rod 180° and if we cross a road from between with a strait rod so it is divide equal .
one side angle will be 90°,
and second side angle will be 90° .
90+90=180
one side angle will be 90°,
and second side angle will be 90° .
90+90=180
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