Geometrical FiguresGeometrical Figures

Present to M.VeerasakdiPresent to M.Veerasakdi

By : Suthiti Phatanapherom Class 4/7 No. 34

Types of QuadrilateralsTypes of Quadrilaterals

parallelogram rectangle

rhombus

square

Trapezoid(us) kite

RectangleRectangle

• A rectangle is a four-sided shape where every angle is a right angle (90°).

• Also opposite sides are parallel and of equal length.

SquareSquare

• A square has equal sides and every angle is a right angle (90°)

• Also opposite sides are parallel

ParallelogramParallelogram

Opposite sides are parallel and equal in length, and opposite angles are equal (angles "a" are the same, and angles "b" are the same)

ab

a b

RhombusRhombus

• A rhombus is a four-sided shape where all sides have equal length.

• Also opposite sides are parallel and opposite angles are equal.

b a

a b

TRIANGLESTRIANGLES• There are several different types of

triangles. • You can classify a triangle by its sides and

its angles. • There are THREE different classifications

for triangles based on their sides.• There are FOUR different classifications

for triangles based on their angles.

Classifying Triangles by SidesClassifying Triangles by Sides

• EQUILATERAL – 3 congruent sides

• ISOSCELES –at least two sides congruent

• SCALENE – no sides congruent

Classifying Triangles by AnglesClassifying Triangles by Angles

• EQUIANGULAR – all angles are congruent

• ACUTE – all angles are acute

• RIGHT – one right angle

• OBTUSE – one obtuse angle

Can You Classify the Different Can You Classify the Different Triangles in the Picture Below?Triangles in the Picture Below?

Classify the following triangles: AED, ABC, ACD, ACEClassify the following triangles: AED, ABC, ACD, ACE

A

B D

E

C

The Classifications…The Classifications…• Triangle AED = Equilateral, Equiangular• Triangle ABC = Equilateral, Equiangular• Triangle ACD = Isosceles, Obtuse• Triangle ACE = Scalene, Right

• So how did you do?