Quadrilaterals:- A quadrilateral is a closed shape with four sides and the internal angles sum up to 360 degrees.
Go through the following sides to understand and memorize the properties easily:-
Triangles:- A closed shape with three sides and where the internal angles add up to 180 degrees is called a triangle. A triangle is classified on the sides and the angles.
Based on the Sides:-
A triangle having three equal sides is called an Equilateral triangle.
A triangle having two equal sides is called an Isosceles triangle.
A triangle having no equal sides is called a Scalene triangle.
Based on the angles:-
A triangle with three acute angles is called an acute-angled triangle.
A triangle that has one obtuse angle is called an obtuse-angled triangle.
A triangle that has one right angle is called a right-angled triangle.
An important point to remember is that the exterior angle of a triangle is the sum of its interior opposite angles.
Solve the following quiz to get better at the above topic:-
Watch the following videos to understand more:-
youtu.be/yiREqzDsMP8 The video for quadrilaterals
youtu.be/mLeNaZcy-hE The video for triangles