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Kuala Lumpur, Malaysia

FORMATIVE ASSESSMENT: IV

CLASS: _______________________ REF: 2014-15/ MATHS/ FA4/ STD 5/ PS-06 NAME: _______________________ SUBJECT: MATHEMATICS DATE: ________________________ TOPIC: Geometry (contd) Polygons:

Polygon is a closed figure made up of line segments that do not cross each other. Polygons are named

according to the number of sides.

S.No Name of the Polygon Number of sides,

corners(vertices) Shape

1 Triangle

4 Quadrilateral

5 Pentagon

6 Hexagon

7 Heptagon

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8 Octagon

9 Nanogon

10 Decagon

A) Identify the type of polygons in the pictures

Shape of the building:

_____________________

Shape of the coin:

__________________

Black shaded part:__________________

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Shape of the STOP board:

_____________________

______________________

Shape of the sign board:

___________________

Shape of a dice:

_______________________

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Triangles:

A triangle is a closed figure made up of

3 line segments

3 angles

3 vertices (corners)

The symbol for triangle is

The sum of the lengths of any two sides of the triangle will always be greater than the length of its

third side

The sum of the angles of a triangle is equal to 180.

Types of Triangles:

Based on angles and based on sides

Acute triangle All its angles are acute angles

Obtuse triangle One of its angle is an obtuse

angle

Right angled

triangle

One of the base angles is a right

angle

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Isosceles triangle

Opposite sides are equal and

both the base angles are equal

(congruent)

Equilateral

triangle

All sides and the angles are

equal

Scalene triangle

All its sides are of different

length. All its angles are

different.

B) Find the third angle and the type of the triangle:

a) 45 , 55 , ______ ; Type : ___________________

b) 133 , 42 , ______ ; Type : ___________________

c) 90 , 45 , ______ ; Type : ___________________

d) 60 , 60 , ______ ; Type : ___________________

e) 30, 60, ________ ; Type : __________________

f) 120, 20,__________; Type : _____________________

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C) Measure the sides and the angles; Name the triangle:

AB =

BC =

CA =

ABC =

BAC =

ACB =

Type:

___________________

PQ =

QR =

RP =

PQR =

QPR =

PRQ =

Type: _________________

B

A

C

P

Q

R

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D) Which of the following cannot be the measures of three angles of a triangle? Why?

1) mA= 90; mB=50; mC=20 ______________________________________

2) mA= 110; mM=90; mC=10 ______________________________________

3) mD= 66; mE=62; mF=52 ______________________________________

4) mP= 98; mQ=42; mR=40 ______________________________________

E) Lengths of three line segments are given. In which case is it possible to construct a triangle and

why?

a) 1cm, 2cm, 3cm _____________________________________________________________

b) 16cm, 7cm, 8cm ____________________________________________________________

c) 9cm, 9cm, 18.5 cm _____________________________________________________________

d) 6cm, 6cm, 12cm _______________________________________________________________

MN =

LM =

NL =

LMN =

LNM =

MLN =

Type: ________________