If triangle rst is an acute triangle, then m∠s must be

less than 90°.
equal to 90°.
equal to 100°.
greater than 90° and less than 180°.

Answer;

m ∠ S must be less than 90°

Explanation;Acute angles are types of angles that are less than 90 degrees. An a cute triangle is a type of triangle who all the three interior angles are less than 90 degrees.

Therefore; if triangle RST is an acute triangle; then;

∠R , ∠S and ∠T, all are less than 90.

An example of acute triangle is an equilateral triangle, which has all three interior angles equal and also all of them are less than 90 degrees, that is all angles in an equilateral triangle are 60°.

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