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If the diagonals of parallelogram are equal then show that it is a rectangula

Posted by Mohit Kumar 8 years, 4 months ago

2 answers

Mona Chaudhary 8 years, 4 months ago

Let take parallelogram ABCD AC=BD given Take triangle ACB and BDA. AB=AB common. AC = BD given AD = BC (oposite side are equal) ACB congurent BDA by SSS. Angle A = B by cpct A+B= 180 ( the sum of suplemantey angle =180) A+A =180. 2A=180. A=180/2. A=90. A+B=180. 90+B=180. B=90. C=B (oposite angle are equal) C=90. A=D ( oposite angle are equal) D=90. ABCD is a rectangle hence prove Because all angle of 90

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Anima Singh 8 years, 4 months ago

Draw a parallelogram ABCD with equal diagonals AC and BD. Now in ∆ABC and ∆DBC , show them congruent. By AB =DC ( opposite sides of parallelogram) , AC = BD ( as given equal diagonals) and BC as common side. Then by SSS congruence rule ∆ABC and ∆DBC become congruent. Then angle ABC and angle DCB are equal by cpct. And as per the property of parallelogram, sum of adjacent angles is180°, so angle ABC + angle DCB =180° Now 2angle ABC = 180 ( ABC and DCB are equal) Angle ABC= 90° And as per the property of rectangle if one angle of a quadrilateral is 90 then it is a rectangle. Hence proved !

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O is the circum center of the triangle abc and D is the midpoint of the base BC prove that angle bod =angle a

Posted by Rishabh Yadav 8 years, 4 months ago

CBSE > Class 09 > Mathematics

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A chord of a circle is equal to the radius of the circle . Find the angle subtended by the chord at a point on the minor arc and also at a point on the major arc

Posted by Debasish Mohanty 8 years, 4 months ago

CBSE > Class 09 > Mathematics

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If non-parallel sides of trapezium are equal proved it is cycli

Posted by Ankit Kholiya 8 years, 4 months ago

CBSE > Class 09 > Mathematics

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construct triangle in which xy =4.5cm yz5.0cm and zx=6.0

Posted by Ishu Lohia 8 years, 4 months ago

CBSE > Class 09 > Mathematics

1 answers

Ankit Kholiya 8 years, 4 months ago

If xyz is triangle xy 4.5cm yz 5 cm and zx 6 cm Sol.

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The total surface,area of a hollw cylinder which is open at both sides is4620cmsp area of base ring is 115.5cm and height 7cm find thickness of cylinder

Posted by Prayansh Tamrakar 8 years, 4 months ago

CBSE > Class 09 > Mathematics

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ABC is a triangle with BC PRODUCED TO D ALSO BISECTORS OF ANgle ABC and bisector of angle acd meet at e show that AMGLE BEC =1/2 OF ANGLE BAC How to prove it?

Posted by Paras Bhandari 8 years, 4 months ago

CBSE > Class 09 > Mathematics

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Prove that heron formula

Posted by Rohan Raj 8 years, 4 months ago

CBSE > Class 09 > Mathematics

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What is polynomials

Posted by Jatin Kukreja 8 years, 4 months ago

CBSE > Class 09 > Mathematics

1 answers

Rishita Arya 8 years, 4 months ago

A polynomial is an expression consisting of variables and coffecients that involves operation of addition ,subtraction ,multiplication and non negative integers exponent of variables. Example 4x-24-3x

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Why the pi value is 22/7 and prove

Posted by Sunnamuddi Saikrishna 8 years, 4 months ago

CBSE > Class 09 > Mathematics

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The total surface area of a hollow cylinder which is open at both side is 4620 sq cm, area of base ring is 115.5sq cm and height 7 cm. Find the thickness of the cylinder

Posted by Vedheeka Sharma 8 years, 4 months ago

CBSE > Class 09 > Mathematics

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What is probability greater than 6 for a singal dice

Posted by Ansh Prajapati 8 years, 4 months ago

CBSE > Class 09 > Mathematics

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Show that if diagonal of A square are equal and bisect each other at right angle

Posted by Piyush Sahare 8 years, 4 months ago

CBSE > Class 09 > Mathematics

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If sum of consecutive interior angle is 180 then prove that lines are perellel.

Posted by Ansh Sharma 8 years, 4 months ago

CBSE > Class 09 > Mathematics

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4^x-3^x-1/2=3^x+1/2-2^x+1/2

Posted by Pankaj Saha 8 years, 4 months ago

CBSE > Class 09 > Mathematics

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What is triangles

Posted by Aditya Goel 8 years, 4 months ago

CBSE > Class 09 > Mathematics

3 answers

Prachi Maithil 8 years, 4 months ago

A plane figure with 3 sides, 3 angles, 3 vertex is called a triangle. Triangle is a closed figure. The sum of all angles of a triangle is 180. There are six types of triangles (a) on the basis of sides (b) on the basis of angles 1.equilateral triangle 2.isosceles triangle 3.scalene triangle 4.right angle triangle 5.acute angle triangle 6.obtuse angle triangle

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Ansh Sharma 8 years, 4 months ago

A plane figure with 3 sides and 3 angles whose sum is 180.

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Kritika Trehan 8 years, 4 months ago

a plane figure with three straight sides and three angles.

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Define Area

Posted by Sahana Chaudhari 8 years, 4 months ago

CBSE > Class 09 > Mathematics

2 answers

The Devil Prince 8 years, 4 months ago

Area is the amount of space covered by a closed figure

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Kritika Trehan 8 years, 4 months ago

Math Term Definition. Area. The area of a flat, or plane figure is the number of unit squares that can be contained within it. The unit square is usually some standard unit, like a square meter, a square foot, or a square inch.

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What is mathematical modelling

Posted by Chitranshu Sinha 8 years, 4 months ago

CBSE > Class 09 > Mathematics

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Kritika Trehan 8 years, 4 months ago

A mathematical model is a description of a system using mathematical concepts and language. The process of developing a mathematical model is termed mathematical modeling.

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In triangle ABC,the bisector AD of Angel A is perpendicular to side BC.Show that AB=AC and thiangle ABC is isosceles.

Posted by Harshit Upadhyay 8 years, 4 months ago

CBSE > Class 09 > Mathematics

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Why the circumference of the circle is 2πr

Posted by Tanishq Sharma 8 years, 4 months ago

CBSE > Class 09 > Mathematics

2 answers

Abhishek Chaurasia 8 years, 4 months ago

22/7

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Manish Mishra 8 years, 4 months ago

22/7

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Show that the sum of any two sides of a triangle is grater than third side .........'

Posted by Sneh Soni 8 years, 4 months ago

CBSE > Class 09 > Mathematics

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Huy guys what's up

Posted by Jatin Kukreja 8 years, 4 months ago

CBSE > Class 09 > Mathematics

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Area of the cube

Posted by Ajay Kumar 8 years, 4 months ago

CBSE > Class 09 > Mathematics

1 answers

Shruti Dadhwal 8 years, 4 months ago

Area of the cube= (side)^3

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In the given figure, O is the centre of the circle. The angle subtended by arc BCD at the centre is 140 . BC is produced to P.D terrine BAD and DCP.

Posted by Neeranjan Kumar 8 years, 4 months ago

CBSE > Class 09 > Mathematics

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I am not understanding in circles chapter

Posted by Darshan S 8 years, 4 months ago

CBSE > Class 09 > Mathematics

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A cubical box has each edge 10cm and another cuboidal box is 12.5cm long ,10cm wide and 8cm high (I) which box has the greater lateral surface area and by how much? (II) which box has the smaller total surface area and by how much?

Posted by Pranay Gera 8 years, 4 months ago

CBSE > Class 09 > Mathematics

1 answers

Bluebell Blue 8 years, 4 months ago

¡) cube=4a Sq 400cm Cuboid = 2h (l+b) 360cm Cube has greater CSA by 40 cm ¡¡)cube=6a Sq 600cm Cuboid =2 (lb+bh+lh) 610 cm Cuboid has greater TSA by 10 cm

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56×79

Posted by Reshma Keerthana 8 years, 4 months ago

CBSE > Class 09 > Mathematics