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
Determine whether the following statement is always, sometimes, or never
m∠ABD + m∠DBC = m∠ABC
If D is in the interior of ∠ABC , m∠ABC=123° and m∠ABD=55°. Find m∠CBD
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If m∠ABD=130° and m∠ABC=50°. Find m∠DBC
Font sizeFont size
Very smallSmallNormalBigVery big
Bold [ctrl+b]
Italic [ctrl+i]
Underline [ctrl+u]
Strike
Superscript
Subscript
Font color
Auto
Justify
Align left
Align right
Align center
• Unordered list
1. Ordered list
Link [ctrl+shift+2]
Quote [ctrl+shift+3]
[code]Code [ctrl+shift+4]
Insert table
Remove Format
Insert image [ctrl+shift+1]
Insert icons of GeoGebra tools
[bbcode]
Text tools
Insert Math
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– Doris Álvarez Quintero

Information: Angle Addition Postulate