Function ∠ABC is an acute angle

angle ABC is an acute angle

Format:

∠ABC is an acute angle

Input:

Output:

Conditional properties that reference this function:

• if (∠ABC is an acute angle) and (∠BCA is an acute angle) and (∠CAB is an acute angle), then △ABC is an acute triangle (link)
• if ∠ABC is an acute angle, then m∠ABC < 90 (link)

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