Please offer a little math help?

Question

Which angle in the figure below measures 90 degrees?

http://tinypic.com/view.php?pic=2rxcfgh&s=4

Thank you in advance!!

Answer 1

Angle BKC. :)

Answer 2

1_ Angle between B and D is 70 degrees

2_Angle between D and C is 20 degrees

These two angles are next to each other so they add up to 90 degrees if you remove the D line you will see a 90 degrees angle between B and C

Answer 3

Angle BC, 70 + 20

Answer 4

B to C are at right angles 70 (between B & D) + 20 (Between D & C)

Answer 5

The angle between B and D is 70 degrees

The angle between D and C is 20 degrees

These two angles are next to each other so they add up to 90 degrees if you remove the D line you will see a 90 degrees angle between B and C

Answer 6

BKC

bkd=70

dkc = 20

70+20=90

Answer 7

angle BKC is 90 degrees --- angle BKD is 70 degrees, and angle DKC is 20 degrees, and 70 plus 20 is 90

Answer 8

Pretty simple. BKC.

A right angle (angle with an exact measure of 90 degrees) = 90 degrees.

angle BKD + angle DKC

70 + 20 = 90

BKC = 90