A(-1,-2)B(b,1),and C(6,-3)are three points and AB is perpendicular to BC I need to find the possible values of b. also find area of triangle formed by A B and C and also find the measure the acute angles need help to learn how to solve

area=(-1,-2)(b,1)(6,-3)

-1(b,1)(6,-3)=-b-1-6+3

b=6-3+1

b=4

area 45degree*90=180cm

angle AB is perpendicular to BC thus its 90 degrees

180-90=90degrees.

the acute angles are

90/2=45 degrees.

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