Quadrilaterals
If the sides of a square are increased by 1%, then by what percent will the area of this square be increased?
by
Vaibhav Raj
The above figure shows five congruent rectangles. A trapezoid is drawn in such a way that its vertices coincide with vertices of some of the rectangles. What percentage of the figure is shaded?
by
Trevor Arashiro
In the diagram to the right, quadrilateral \(ABCD\) is a parallelogram and \(M\) is the midpoint of \(\overline{DC}.\)
If the area of \(\triangle BNC\) is \(42,\) what is the area of \(\triangle MNC?\)
by
Hemang Agarwal
In rectangle ABCD (below left), \(AB=3\) and \(BC=5\). The corner at C is folded up (below right) and lands on \(\overline{AB}\) so that \(AC=2\) and \(CB=1\).
The area of quadrilateral CPNM can be written as \(\frac{m}{n}\), where m and n are positive, coprime integers. Find \(m+n\).
by
Matt Enlow
What is the area of a rhombus of side 13 such that the sum of its two diagonals is 34?
by
Paola Ramírez