Question

Answer these 5 questions.
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Answer 1

Answer:

76.) 10°

77.) 30°

78.) 18°

79.) 20°

80.) Question unclear

Step-by-step explanation:

76.) ∠AOB = 180°   [Straight Line]

      ∠AOC + ∠AOD = 85° + 85° = 170°

      ∠COD = ∠AOB - (∠AOC + ∠AOD)

      ∠COD = 180° - 170°

      Hence, ∠COD = 10°

77.) 2x + 3x + x = 180° [Straight Line]

     6x = 180°

     x = 180°/6

     x = 30°

     Acc, to Sum

     x = y [Vertically Opposite Angles]

     Hence, y = 30°

78.) y/x = 5

     y = 5x --(1)

     and z/x = 4

     z = 4x --(2)

     Acc to sum,

      x + y + z = 180° --(3)

     Substitute (1) and (2) in (3)

     x + 5x + 4x = 180°

     10x = 180°

     x = 180°/10°

     Therefore, x = 18°

79.)Acc to Sum

     (3x + 10) + x = 90°

     4x = 90° - 10°

     x = 80°/4

     Hence, x = 20°

80.) Question Unclear