Practice problem
If in rhombus ABCD, angle A=100∘A = 100^{\circ}A=100∘ and angle B=80∘B = 80^{\circ}B=80∘, what is ∣m∠C−m∠D∣|m\angle C - m\angle D|∣m∠C−m∠D∣?
20∘20^{\circ}20∘
40∘40^{\circ}40∘
15∘15^{\circ}15∘
30∘30^{\circ}30∘
Type a concept, like “slope” or “photosynthesis”.