A) find the internal angle sum (s)
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interior angles =180(n-2)

180 (5-2)

180×3=540

540-(155+80+95+90)=x

x=120

Step-by-step explanation:

a)   ( n - 2 ) × 180°, where n = 5

     ( 5 - 2 ) × 180° = 3 × 180° = 540°

b)    Total sum must equal 540° so

       80° + 155° + 95° + ( The right angle which is 90° ) + x = 540°

       420° + x = 540°

        x = 120°

20335+282=20617

step-by-step explanation:

you can't solve x because it is 2 linear equation and you only have one equation