Question

J and M are base angles of isosceles trapezoid JKLM. If mJ = 20x + 9, and mM = 14x + 15, find mK.
(picture in comments)
151o
1o
29o
75.5o

Answer 1

since J and M are base angles of the isosceles trapezoid are equal



So J = M

so you need to solve for x

20x + 9 = 14x + 15

once you know x you will be able to side the measure of K

because it will be co-interior to J.

Co-interior angles are add to 180. and KL and JM are parallel

hope this helps

Answer 2

Thank you !