Problem preview
G-GMD.6 Warmup M2-040-A02-V01

Use triangle angle-side relationships and triangle inequality in mathematical and real-world problems.

Find the possible range for a missing triangle side

Problem

A triangle has \(\text{two}~\text{side}~\text{lengths}\) \(5\) and \(8\). What is the possible range for the third side \(x\)?

Big Picture

What this problem is really about

A third side is constrained from both directions: it must be long enough to bridge the difference and short enough for the other sides to meet. We’ll build the lower bound from the absolute difference, the upper bound from the sum, and keep both endpoints open because equality flattens the triangle.

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Four variants of this problem type
Curriculum context
Course
Math II
Standard
G-GMD.6
Category
Geometry
Domain
Geometric Measurement and Dimension
Objective
Use triangle angle-side relationships and triangle inequality in mathematical and real-world problems.
Problem type
Find the possible range for a missing triangle side