# Geometry: Triangle Names and Angles

In this worksheet, students name the different types of angles and triangles.

Key stage:  KS 2

Curriculum topic:   Maths and Numerical Reasoning

Curriculum subtopic:   2D Shapes: Triangles, Quadrilaterals and Polygons

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
• Question 2

What is the name given to.....

a triangle with a 90º angle

right-angled
• Question 3

What is the name given to.....

a triangle with three equal angles

equilateral
• Question 4

What is the name given to.....

a triangle with three different angles

scalene
• Question 5

What is the name given to.....

a 190º angle

reflex
• Question 6

What is the name given to.....

a 170º angle

obtuse
• Question 7

What is the name given to.....

a triangle with two equal angles

isosceles
• Question 8

What is the name given to.....

a 180º angle

straight angle
• Question 9

What is the name given to.....

a triangle with angles 50º, 80º, 50º

isosceles
• Question 10

What is the name given to.....

a 19º angle

acute
---- OR ----

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