Three angles of a quadrilateral measure56,115 and 84. Find the measure of fourth angle
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<A=56° , <B=115° , <C=84° , <D=?
As sum of all angles of a quadrilateral is 360,
then,
<A + <B + <C + <D = 360°
56° + 115° +84° + <D =360°
255° + <D = 360°
<D =360° - 255°
<D = 105°
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