Question

A quadrilateral has congruent side lengths. 2 opposite angles have measures of 100 degrees. The other 2 opposite angles have measures of 70 degrees and (5 x) degrees. What is the value of x

Answer 1

Answer: 18

Explanation:

Angles of a quadrilateral add to 360 degrees, so

`100+100+70+5x=360\\\\270+5x=360\\\\5x=90\\\\x=18`