Question

9th std math part 2chapter 3 triangles practice set 3.1 Q 9 answer ​

Answer 1

Answer:

The measures of angle a, angle b, angle ç are 30°, 70° and 80° respectively.

Step-by-step explanation:

angle b=70° (1) {vertically opposite angles}

angle c+100°=180° {angles in a linear pair}

Therefore, angle c =80°-100°

Therefore, angle c=80° (2)

In the triangle,

angle a + angle b + angle c =180° {sum of measures of angles of a triangle}

Therefore, angle a + 70°+80°=180° {from (1) and (2) }

Therefore, angle a =180°-150°

Therefore, angle a=30°

Therefore, The measures of angle a, angle b, angle ç are 30°, 70° and 80° respectively.

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