If triangle RST is an acute triangle, then m∠S must be
a. less than 90°.
b. equal to 90°.
c. equal to 100°.
d. greater than 90° and less than 180°.
If triangle RST is an acute triangle, then m∠S must be
a. less than 90°.
b. equal to 90°.
c. equal to 100°.
d. greater than 90° and less than 180°.