An acute-angled triangle has three angles that are all less than 90°. A right-angled triangle has one angle that is exactly 90°. An obtuse-angled triangle has one angle that is greater than 90°.

It categorizes triangles into equilateral, isosceles, scalene, obtuse, right, and acute based on their sides and angles. The video also covers the concept of congruency, demonstrating how two ...

Acute-angled triangle. In an acute-angled triangle, all three angles are acute. SUBJECTS: Maths. YEARS: 5–6, 7–8. A triangle is a three-sided shape, where the sides are straight and meet at ...

Acute angle triangle has all of its angles less than 90° in measure. Rectangle: It is a four sided polygon with opposite sides equal to each other and the sum of all of its angles is equal to 360°.