Question

in triangle ABC AB is equal to AC is equal to 15 cm and BC is equals to 18 cm find cos angle abc​

Answer 1

Answer:

3/5

Step-by-step explanation:

Here ABC is a triangle in which AB = 15 cm , Ac = 15 cm and BC = 18 cm

Draw AD perpendicular to BC ,D is mid - point of BC .

Then ,BD = DC = 9 cm

In right angled triangle ADB

By Pythagoras theorem , we get

AD = 12 cm

cos angle ABC = Base / Hypotenuse

In right angled∆ ABD , Angle ABC = Angle ABD

= BD / AB

= 9/15

= 3/15