If triangle RST is an acute triangle, then m∠S must be
Answer
A
less than 90°.
B
equal to 90°.
C
equal to 100°.
D
greater than 90° and less than 180°.
Explanation
An acute triangle has three acute angles. Each acute angle measures less than 90°, so m∠S must be less than 90°. The choice “less than 90°” is correct.
AI-written and checked against the verified answer.