1. Arrange the replica if triangles shown in fig 3
2. EFGH is a rectangle.
3. Diagonal AC is a equal length of rectangle EFGH.
4. Diagonal DB is a equal breadth of rectangle EFGH
5. Area of Rhombus = 1/2 X Area of Rectangle
=1/2 X Length X Breadth
=1/2 X D1 X D2
=1/2 X Product of Diagonals
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Answers
Answer:
Example 3 : If the diagonals of a quadrilateral bisect each other at
right angles, it will be a
(a) rhombus (b) trapezium
(c) rectangle (d) kite
Solution : The correct answer is (a).
Example 4 : The sum of the angles of a quadrilateral is
(a) 180° (b) 270° (c) 360° (d) 300°
Solution : The correct answer is (c).
Example 5 : In a square ABCD, the diagonals meet at point O. The
∆AOB is
(a) isosceles right triangle
(b) equilateral triangle
(c) isosceles triangle but not right triangle
(d) scalene right triangle.
Solution : The correct answer is (a).
Quadrilaterals with certain properties are given additional names. A
trapezium has exactly 1 pair of parallel sides. A parallelogram has 2 pairs
of parallel sides. A rectangle has 4 right angles. A rhombus has 4 congruent
sides. A square has 4 congruent sides and 4 right angles.
12/04/18
Example 6 : ABCD is a quadrilateral in which AB = 5 cm, CD = 8 cm
and the sum of angle A and angle D is 180°. What is the
name of this quadrilateral?
(a) Parallelogram (b) Trapezium
(c) Rhombus (d) Can not be determined
Solution : The correct answer is (b).
Example 7 : Rukmini has a farm land which is triangular in shape.
What is the sum of all the exterior angles taken in an
order of the farm land?
(a) 90° (b) 180° (c) 360°
(d) Can not be determined.
Solution : The correct answer is (c).
Example 8 : How many sides does an octagon have?
(A) 7 (b)
Step-by-step explanation: