Question

5, Let ARC be a triangle such that AB = 6 V3 cm, AC = 12 cm
and BC = 6 cm. Angle B is​

Answer 1

Step-by-step explanation:

hii ....

here your answer...........

use this formula.

b^2=c^2+a^2-2cacos(B).

let here b=12 cm.

c=6root(3)cm

a=6cm.

so...

12^2=[6root (3)]^2+6^2-2*6root(3)*6*cos(B).

144=144-36root(3)cos(B).

So ...cos(B)=0.

B=cos^-1(0).

B=90°.

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