Question

In a triangle ABC AB=4cm, BC=9 cm and AC=7 cm.Find the length of the perpendicular from A to BC​

Answer 1

Answer:

sorry I don't know the answer of this question

Answer 2

Answer:

by heron's formula:

s=10

area ABC= √10(10-4)(10-9)(10-7)

=√10×6×1×3

=√2×5×2×3×3

=6√5

area of ABC= 1/2×AD×BC

6√5=1/2×AD×9

12√5/9=AD

AD=4√3/3

AD=4/√3