8.
(i) The three angles of a quadrilateral are 115°, 78° and 84°. Find the fourth angle.
(ii) Find the fourth angle of a quadrilateral if its three angles are 98°, 115° and 77º.
(i) The angles of a quadrilateral are in the ratio 1:2:3 : 4. Find all the angles.
4.
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Answer:
(i)Sum of all angles of a quadrilateral is 360 degree.
so,to find the fourth angle we need to do so
360-(115+78+84)
=360-277
=83 degree
(ii)360-(115+98+77)
=360-290
=70 degree
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