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# F 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°.

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Given: Triangle RST is an acute triangle.Find: the Angle of the SSolution: As we know that the sum of the angles of a triangle is 180°. Since the triangle is acute angled triangleSo, all the angles of a triangle must be less than 90°.I.e ∠R<90°,∠S<90° and∠T<90°So, the Solution is ∠S<90°Drawing an acute angle of the triangle below