Here AB=5cm,BC=12cm, AC=13cm.AC2=AB2+BC2 ABC is a right angled triangle at ∠B.Area ABC=1/2(BCxBA)=1/2(12x5)=1/2x60=30cm2Also Area of ABC=1/2xACxBD=1/2(13xBD)30=1/2(13xBD)13XBD=30x2BD=60/13BD=4.6 cm

Q. 104.7( 6 Votes )

A triangle has si

Class 10th RD Sharma - Mathematics 4. Triangles

Answer :

Here AB=5cm,BC=12cm, AC=13cm.

AC2=AB²+BC²

ABC is a right angled triangle at ∠B.

Area ABC=1/2(BCxBA)

=1/2(12x5)

=1/2x60

=30cm²

Also Area of ABC=1/2xACxBD

=1/2(13xBD)

30=1/2(13xBD)

13XBD=30x2

BD=60/13

BD=4.6 cm

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