alleryStart learning →By definition, what makes a triangle a right triangle?
AIt has three equal sides all around
BIt has one angle greater than 90 degrees
CIt has exactly one 90 degree angle
DIt has no two sides of equal length
Answer & Solution
Correct answer: C. It has exactly one 90 degree angle
1. A right triangle is defined by a single feature among its three angles.
2. That feature is having exactly one angle that measures 90 degrees.
3. This 90 degree angle is usually marked with a small square at its vertex, distinguishing it from other triangles.
_Source: OpenStax Elementary Algebra (CC BY 4.0), Ch 3 "Math Models", section 3.4 Solve Geometry Applications: Triangles, Rectangles, and the Pythagorean Theorem_
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