Question

9) Three angles of a quadrilateral are equal. The
fourth angle is 120°. Find the measure of the
equal angles.​

Answer 1

Answer:

let the measure of same angles be x

therefore

x + x + x+ +120 =360

( sum of angles of quadrilateral equals to 360 )

3x+120=360

3x=360-120

3x=240

x=240/3

x= 80

equal angles measure 80 degrees

Step-by-step explanation:

hope it helps

Answer 2

Answer:

80°

Step-by-step explanation:

Given:

• Three angles of a quadrilateral are equal.
• The fourth angle = 120°

To Find:

• Measurements of the equal angles

Solutions:

Let the equal angles be x.

☆ Sum of four angles of quadrilateral =360°

=> x + x + x + 120° = 360°

=> 3x + 120° = 360°

=> 3x = 360° - 120°

=> 3x = 240°

=> x = 240°/3

x = 80°

Therefore, the measurement of the equal angles = 80°