 # Geometry: Triangle Names and Angles

In this worksheet, students name the different types of angles and triangles. Key stage:  KS 2

Curriculum topic:   Geometry: Properties of Shapes

Curriculum subtopic:   Compare Geometric Shapes

Difficulty level:   ### QUESTION 1 of 10

ANGLES

An acute angle is less than 90º

right angle is 90º

An obtuse angle is between 90º and 180º

straight line angle is 180º

reflex angle is between 180º and 360º

TRIANGLES

A right-angled triangle has one 90º angle

An isosceles triangle has two equal angles

An equilateral triangle has three equal angles, each of size 60º

A scalene triangle has three different angles

What is the name given to.....

a 90º angle

acute

obtuse

right angle

straight angle

reflex

scalene

isosceles

equilateral

right-angled

What is the name given to.....

a triangle with a 90º angle

acute

obtuse

right angle

straight angle

reflex

scalene

isosceles

equilateral

right-angled

What is the name given to.....

a triangle with three equal angles

acute

obtuse

right angle

straight angle

reflex

scalene

isosceles

equilateral

right-angled

What is the name given to.....

a triangle with three different angles

acute

obtuse

right angle

straight angle

reflex

scalene

isosceles

equilateral

right-angled

What is the name given to.....

a 190º angle

acute

obtuse

right angle

straight angle

reflex

scalene

isosceles

equilateral

right-angled

What is the name given to.....

a 170º angle

acute

obtuse

right angle

straight angle

reflex

scalene

isosceles

equilateral

right-angled

What is the name given to.....

a triangle with two equal angles

acute

obtuse

right angle

straight angle

reflex

scalene

isosceles

equilateral

right-angled

What is the name given to.....

a 180º angle

acute

obtuse

right angle

straight angle

reflex

scalene

isosceles

equilateral

right-angled

What is the name given to.....

a triangle with angles 50º, 80º, 50º

acute

obtuse

right angle

straight angle

reflex

scalene

isosceles

equilateral

right-angled

What is the name given to.....

a 19º angle

acute

obtuse

right angle

straight angle

reflex

scalene

isosceles

equilateral

right-angled

• Question 1

What is the name given to.....

a 90º angle

right angle
EDDIE SAYS
A 90º angle is a right angle.
• Question 2

What is the name given to.....

a triangle with a 90º angle

right-angled
EDDIE SAYS
A triangle with a 90º angle is a right-angled triangle.
• Question 3

What is the name given to.....

a triangle with three equal angles

equilateral
EDDIE SAYS
Equilateral means equal angles.
• Question 4

What is the name given to.....

a triangle with three different angles

scalene
EDDIE SAYS
Scalene triangles have 3 different angles.
• Question 5

What is the name given to.....

a 190º angle

reflex
EDDIE SAYS
A reflex angle measures a 190º
• Question 6

What is the name given to.....

a 170º angle

obtuse
EDDIE SAYS
An obtuse angle is greater than 90º and less than 180º
• Question 7

What is the name given to.....

a triangle with two equal angles

isosceles
EDDIE SAYS
An isosceles triangle has two equal angles.
• Question 8

What is the name given to.....

a 180º angle

straight angle
EDDIE SAYS
A straight angle measures 180º
• Question 9

What is the name given to.....

a triangle with angles 50º, 80º, 50º

isosceles
EDDIE SAYS
An isosceles triangle has two equal angles.
• Question 10

What is the name given to.....

a 19º angle

acute
EDDIE SAYS
An acute angle is less than 90 degrees.
---- OR ----

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