Problem preview
G-GMD.6 Warmup M2-040-A04-V01

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

Order triangle angles from side lengths

Problem

A triangle has side lengths \(AB=5\), \(BC=7\), \(AC=9\). Order the angles from largest to smallest.

Big Picture

What this problem is really about

Side order transfers to angle order only through opposite pairs. We’ll rank the three side lengths, map each side to the vertex it does not touch, use longer-side-opposite-larger-angle, and then read the angle order in the requested largest-to-smallest direction.

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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
Order triangle angles from side lengths