Angle Addition Postulate
Activity
Drag the points A, B, C and D in the sketch below
Determine whether the following statement is always, sometimes, or never true.
D is in the interior of ∠ABC
Sometimes
Always
Never
Determine whether the following statement is always, sometimes, or never
m∠ABD + m∠DBC = m∠ABC
Always
Sometimes
Never
If D is in the interior of ∠ABC , m∠ABC=123° and m∠ABD=55°
m∠CBD=?
If m∠ABD=130° and m∠ABC=50°
m∠DBC=?
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Información: Angle Addition Postulate