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Geometry
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Hong Kong
Stage 1

Types of Triangles

Lesson
Practice

Interactive practice questions

Based on the length of the sides, choose the most appropriate classification for the triangles as scalene, isosceles, or equilateral.

a

A triangle with its dimensions labeled. The first side measures $10$10 cm, the second side measures $12$12 cm, and the third side measures $8$8 cm.

Isosceles

A

Equilateral

B

Scalene

C
b

An obtuse triangle with its dimensions labeled. The first and second side measures $7$7 cm, and the third side measures $9$9 cm.

Isosceles

A

Scalene

B

Equilateral

C
c

A right triangle with its dimensions labeled. The horizontal base of the triangle measures $12$12 cm. The vertical side measures $5$5 cm. And the hypotenuse measures $13$13 cm.

Equilateral

A

Isosceles

B

Scalene

C
d

A triangle with its dimensions labeled. All three sides are labeled to measure $10$10 m.

Scalene

A

Equilateral

B

Isosceles

C
e

A triangle with its dimensions labeled. The first and second side measures $7$7 m, and the third side measures $9$9 m.

Isosceles

A

Equilateral

B

Scalene

C
f

A triangle with its dimensions labeled. All three sides are labeled to measure $7$7 m.

Isosceles

A

Equilateral

B

Scalene

C
Easy
1min

State whether the following triangles are scalene, isosceles or equilateral

Easy
< 1min

Based on the indicators, classify the following triangles:

Easy
< 1min

Which two of the following triangles are equilateral?

Easy
< 1min
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