NO
Yes to both
Sometimes an isosceles triangle but never a scalene triangle with 3 interior acute angles.
Yes, an acute triangle can also be scalene.
A scalene triangle is a triangle that has three unequal sides.
No.
Yes
It is an acute angled scalene triangle.
In an acute triangle, all three angles are acute.
No triangle is a quadrilateral.
An acute scalene triangle has none. An acute isosceles triangle has one and an [acute] equilateral has three.
A scalene triangle can have 1 obtuse angle and 2 different acute angles or it can have 3 different acute angles providing that the 3 angles in both scalene triangles add up to 180 degrees.