12. A diagonal of a quadrilateral is 40 m long and the perpendiculars to it from the opposite corners
are 8 m and 10 m respectively. Find Its area. (Fig.
11.15)​

The construction of copying qpr is started below. the next step is to set the width of the compass to the length of ab. how does this step ensure that a new angle will be congruent to the original angle? by using compass take the measures of angle and draw the same arc according to it.