Page 262 - ICSE Math 6

Classification of Triangles

On the basis of sides On the basis of angles

Equilateral Acute-angled
Having 3 equal sides Having 3 acute angles

Isosceles Right-angled
Having 2 equal sides Having 1 right angle

Scalene Obtuse-angled
Having unequal sides Having 1 obtuse angle

Parts of a Quadrilateral

Adjacent sides
Two sides having a point in common

Adjacent angles
Two angles having a common arm

Opposite sides
Two sides with no common point

Opposite angles
Two angles with no common arm

Interior
Set of all points lying inside the quadrilateral

Exterior
Set of all points lying outside the quadrilateral

Diagonal
A line segment joining any two non-consecutive vertices

Types of Quadrilaterals

Parallelogram: Having two Rectangle: A parallelogram with right
pairs of parallel sides. angles and unequal adjacent sides.

Square: A rectangle with Rhombus: A parallelogram with
equal adjacent sides. equal adjacent sides.

Trapezium: Having a pair of Kite: Having exactly two pairs of
parallel sides. equal adjacent sides.

246