Fill in the gaps.
The opposite sides of rectangle are _____.

Fill in the gaps. Oblique sides of isosceles trapezium are ______.

Fill in the gaps. The diagonals of parallelogram _______ each other.

Fill in the blanks: If the opposite angles of a quadrilateral are supplementary then the vertices of the quadrilateral are____.

The coordinates of two opposite vertices of a rectangle are (1,3) and (5,1) . If other two vertices are on the line y=2x-lambda then the value of lambda will be -

Fill in the gaps. Rhombus is a special type of __________.

Fill n the blanks The sides of an equilateral triagnle are the___of its incircle.

Show that the line segments joining the midpoints of the opposite sides of a quadrilateral and bisect each other.

A perpendicular AD is drawn on BC from the vertex A of the acute Delta ABC . Prove that AC^(2) = AB^(2) +BC^(2) -2BC.BD OR Prove that the square drawn on the opposite side of theacute angle of an acute triangle is equal to the areas of the sum of the squares drawn on its other two sides being subtracted by twice the area of the rectangle formed by one of its sides and the projection of the other side to this side.

Show that the straight lines joining the mid - points of the opposite sides of a quadrilateral bisect each other .

Fill in the gaps: 2a xx 3b = square