Everything Maths Grade 10

b)

N P

M

O

Q R

K

L

(^12)
(^3124) ◦
2
(^13)
45 ◦
c)
K

L

M N

T 2 Y

1

3

95 ◦

(^21)
385 ◦
7.IfABis parallel toCDandABis parallel toEF, explain whyCDmust be parallel toEF.

A

C

E

B

D

F

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1.2G5Y 2.2G5Z 3.2G62 4.2G63 5.2G64 6a.2G65 6b.2G66 6c.2G67 7.2G68

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7.2 Triangles EMA5R

Classification of triangles EMA5S

A triangle is a three-sided polygon. Triangles can be classified according to sides: equilateral, isosceles and
scalene. Triangles can also be classified according to angles: acute-angled, obtuse-angled and right-angled.

We use the notation△ABCto refer to a triangle with vertices labelledA,BandC.

242 7.2. Triangles