The angles of quadrilateral are in the ratio 3 : 5 : 9 : Find all the angles of the quadrilateral. Byjus class 8 maths chapter 9 lib Let the angles of the quadrilateral be 3x, 5x, 9x and 13x. If the diagonals of a parallelogram are equal, then show that it is a rectangle. Show that if the diagonals of a quadrilateral bisect each other at right angles, then it is a rhombus.
Alternatively : ABCD can be proved first a parallelogram then proving one pair of adjacent sides equal will result in rhombus. Show that the diagonals of a square are equal and bisect each other at right angles.
Show that if the diagonals of a quadrilateral are equal and bisect each other at right angles, then it is a square. Thus, ABCD is a square. ABCD is a rhombus. Question 1. AC is a diagonal. Question 2. Show that the quadrilateral PQRS is a rectangle. Join AC.
Thus, PQRS is a rectangle. Question 3. Show that the quadrilateral PQRS is a rhombus. Hence, PQRS is a rhombus. Question 4. Show that F is the mid-point of BC.
Question 5. Solution: Since, the opposite sides of a parallelogram are parallel and equal. Question 6. Show that the line segments joining the mid-points of the opposite sides of a quadrilateral bisect each.
And the diagonals of a parallelogram bisect each other, i. Thus, the line byjus class 8 maths chapter 9 lib joining the midpoints of opposite sides of a quadrilateral ABCD bisect each. Question 7.
ABC is a triangle right angled at C. RD Sharma Class 12 Solutions. Watch Youtube Videos.
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