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can all angles of a quadrilateral be acute?give reasons for your answer.

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no.it is not possible for all angles of an quadrilateral to be acute.the sum of all angles of a quadrilateral is 260.for example.if we take three angles to be acute i.e. 45,67,58,then
45+67+58+x=360
170+x=360
x=360-170
x=190
which is not an acute angle.
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no all angles of a quadrilateral can not be acute because their sum of angles will not be 360 degrees. 
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