Triangles ·

01 Jul 2024, 00:00

Triangles

What is a Triangle:

A polygon with 3 edges,
3 vertices, 3 angles.We take 3 points and connect them with 3 sides below denoted as ΔPQR:
Segment

Properties of a Triangle:

Sum of the three interior angles = 180°
Sum of the 2 sides > 3rd side
A triangle with vertices (points) P, Q, R:
is denoted as ΔPQR

Area of a Triangle

With base b and height h:
A = 1/2bh

Acute Triangle:

All 3 angles measure less than 90°
Segment

Right Triangle:

Has one angle measuring 90° (right)
The other two angles < 90°
Segment

Obtuse Triangle:

Has only one angle measuring > 90°
Obtuse angle is opposite the long side
Segment

Scalene Triangle

No Sides Are Equal
Segment

Isosceles Triangle

2 sides Are Equal
Segment

Equilateral Triangle

All 3 sides are equal
Segment

How does the Triangles Calculator work?

Free Triangles Calculator - This lesson walks you through the basics of a triangle and shows you triangle types like acute, right, obtuse, scalene, isosceles, equilateral.

What 2 formulas are used for the Triangles Calculator?

Triangle PQR is written as ΔPQR
The sum of the three interior angles of a triangle equals 180°

For more math formulas, check out our Formula Dossier

What 7 concepts are covered in the Triangles Calculator?

acute triangleA triangle for which all interior angles are acute.equilateral triangleA triangle with 3 equal sidesisosceles triangleA triangle with two equal sides and an unequal third sideobtuse triangleA triangle which has an obtuse angle as one of its interior angles.right triangle triangle in which one angle is a right anglescalene trianglea triangle with three unequal sidestrianglea flat geometric figure that has three sides and three angles