Alright, guys! Let's see what you guys know about shapes!
A triangle with at least one right angle is a right triangle.
An acute angle ("acute" meaning "sharp") is an angle smaller than a right angle (it is less than 80 degrees).
Actually, It's an angle less than 90 degrees.
An obtuse angle is an angle of greater than 90° and less than 180°. It is bigger than an acute angle. An acute angle is the cave's entrance. An angle of 90°, as in a corner of a square or at the intersection of two perpendicular straight lines is a right angle.
An isosceles triangle is a triangle with two equal sides. The angles opposite the equal sides are also equal.
Nice job everyone! We will continue this subject tomorrow, but it is time for school to come to a close.