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1. The measure of angle A is 49° ( option C)

2. The value of x 7 ( option D)

3. 178° is an obtuse angle . (option C)

4. The angle is an obtuse angle

5. The triangle is an obtuse isosceles triangle ( option B)

6. The triangle is obtuse scalene triangle ( option A)

A triangle is a three sided polygon. There are different types of triangle, like scalene, acute, isosceles, obtuse e.t.c

The sum of angle in a triangle is 180°.

1. 4x + 1 + 3x + 11 + 84 = 180

7x + 96 = 180

7x = 180 - 96

7x = 84

x = 84/7

x = 12

angleA = 4x + 1 = 4(12) + 1

= 49°

2. 80 + 45 + 7x + 6 = 180

131 + 7x = 180

7x = 180 - 131

7x = 49

x = 7

3. 178° is an obtuse angle .

4. The angle is an obtuse angle.

5. The triangle is an obtuse isosceles triangle.

6. The triangle is obtuse scalene triangle.

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