Sides in a quadrilateral ABCD the four line segments ABBC.CD and DA are called its sides.

Diagonals in the quadrilateral ABCD the line segments AC and BD are called its diagonals.

Sides the three line segments ABBC and CA that form the triangle ABC are called the sides of the triangle ABC.

Find the area of a quadrilateral ABCD whose sides AB,BC, CD and DA are 9 cm, 40 cm, 28 cm and 15 cm respectivelyand the angle between the firswt two sides is a right angle.

In a quadrilateral ABCD, show that (AB+BC+CD+DA)gt(AC+BD) .

ABCD is a quadrilateral. Forces vec(AB), vec(CB), vec(CD) and vec(DA) act along its sides. What is their resultant ?

ABCD is a quadrilateral. Force vec(AB), vec(CB), vec(CD) and vec(DA) act along its sides. What is their resultant ?

ABCD is a quadrilateral. Is AB+BC +CD + DA gt AC + BD ?

ABCD is a quadrilateral. Is AB+ BC + CD+ DA gt AC+ BD ?

In Figure 3, a circle touches all the four sides of a quadrilateral ABCD whose sides are AB = 6cm,BC=9cm and CD=8cm. Find the length of side AD.