plze solve the problem 7,8,9,10 no question............
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7. as per triangle law, the sum of all angles in a triangle equals 180'
therefore, angle A+ angle B + angle c=180'
80' + 30' + AngleBCA = 180'
BCA= 70'
Now since x+bca = 90'
x= 20'
8. angle c= 180' - 120'=60' bcoz they are collinear
angle bac= 60' as they are vertically opposite angles
Now by triangle property angle b = 180- 60-60= 60
therefore, angle A+ angle B + angle c=180'
80' + 30' + AngleBCA = 180'
BCA= 70'
Now since x+bca = 90'
x= 20'
8. angle c= 180' - 120'=60' bcoz they are collinear
angle bac= 60' as they are vertically opposite angles
Now by triangle property angle b = 180- 60-60= 60
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