IXL | Classify triangles and quadrilaterals: review

What kind of triangle is this?

36°

65°

79°

acute

right

obtuse

ref_doc_title.

Learn with an example

question

What kind of triangle is this?

62°

37°

81°

acute

right

obtuse

key idea

In an acute triangle, all three angles are less than 90°.
In a right triangle, one angle is exactly 90°.
In an obtuse triangle, one angle is greater than 90°.

solution

This triangle is an acute triangle. All 3 angles are less than 90°.

Looking for more? Try these:

Lesson: Types of triangles

Lesson: Types of quadrilaterals

$Confetti$

Excellent!

Now entering the Challenge Zone—are you ready?

Questions
answeredQuestions

Time
elapsedTime

hr	min	sec
00	00	02

SmartScore
out of 100
IXL's SmartScore is a dynamic measure of progress towards mastery, rather than a percentage grade. It tracks your skill level as you tackle progressively more difficult questions. Consistently answer questions correctly to reach excellence (90), or conquer the Challenge Zone to achieve mastery (100)! Learn more

Teacher tools

Work it out

Not feeling ready yet? These can help:

QQ.6Classify quadrilaterals

PP.1Acute, obtuse, and right triangles

PP.2Scalene, isosceles, and equilateral triangles

Lesson: Types of triangles

Lesson: Types of quadrilaterals

Excellent! You got that right!

Jumping to level 1 of 1

Excellent!