Question

Rhombus ABCD , m 12 years ago

Answer 1

Rhombus has 360 in it so 360-200= 160. 160/2= 80. 80/ 2 again would be 40 so 40 would be it.

Answer 2

Opposite angles of a rhombus are equal. So A = C = 100
The four internal angles of ANY quadrilateral add up to 360 degrees.
So A + B + C + D = 360
100 + B + 100 + D = 360
B + D = 360 - 200 = 160
B = D
so 2B = 160
B = 80
The diagonals of a rhombus bisect the angles. So DBC = 80/2 = 40 degrees.

(same answer as Nick but with a detailed explanation of the steps).