Question

A scalene triangle is always an acute-angled triangle.
i) An isosceles triangle can also be an obtuse-angled triangle​

Answer 1

Answer:

An obtuse-angled triangle can be a scalene triangle or isosceles triangle but will never be equilateral since an equilateral triangle has equal sides and angles where each angle measures 60°. ... Therefore, it is called an obtuse-angled triangle or simply an obtuse triangle.

Answer 2

Answer:

An acute triangle is a triangle in which each angle is an acute angle. Any triangle which is not acute is either a right triangle or an obtuse triangle. All acute triangle angles are less then 90 degrees. For example, an equilateral triangle is always acute, since all angles (which are 60) are all less than 90.

An obtuse-angled triangle can be a scalene triangle or isosceles triangle but will never be equilateral since an equilateral triangle has equal sides and angles where each angle measures 60°.