Question

Please solve question 9 and 11

Answer 1

9 ) x + 2x + 3x = 180

                   6x = 180

                      x = 180/6

                      x = 30

11)  let the measures of 3 angles of a triangle be a b and c

∴ by angle sum property , a + b + c = 180

given a+b = c

substituting for c in first equation we get

                    c + c = 180

                         2c = 180

                           c = 180 / 2

                           c = 90

since one angle is 90° the triangle is a right triangle

∴ the angles are 30° , 60° , 90°