Question

ABC is a triangle in which AB=AC=4cm and angle a=90 degree.calculate the area of triangle ABC. also find the length of perpendicular from A to BC.

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Answer 1

ans:- 2.83

Explanation:

Using Pythagoras theoram in the right triangle ABC we get

AB

2

+AC

2

=BC

2

4

2

+4

2

=BC

2

∴BC=4

2

Areaofatriangle=

2

1

×AB×AC

=

2

1

×4×4=8

=

2

1

×BC×AD=8(Taking BC as base and AD as height)

=

2

1

×4

2

×AD=8

AD=2

2

=2×1.41429=2.83

Answer 2

Answer:

area of right angled triangle is ½ base×height is 8 cm²

and length of perpendicular is 2.8