Answer the question to be marked as the brainliest
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Three quadrilaterals = 3 × 360 = 1080
The sum of measure of angle a, b, c, d, e, f, g, h, i =1080 - 180= 900
Because of remaining unnamed angels we can arrange like linear pair of angle and we know that measure of linear pair of angle is 180°
=1080 - 180 = 900
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