1angle of a quadrilateral is 180 degrees & the remaining 3 angles are equal find the 3 angles (answer given 84 degrees)

Step-by-step explanation:

The total degrees is always 360. So whe get 360=180+3x. 360-180=3x. 180=3x. x=60. I don't know how you're supposed to get 84 degrees.

Step-by-step explanation:

We know that , the circumference of a circle is given by :-

, where r is the radius of the circle.

Formula for radius :  

, where C is the circumference of the circle.

Given : Circumference of circle = 15 ft.

Then , the radius of a circle will be :-

Hence, the radius of a circle=