Final: Isosceles Chase

Part of the Angles section of Coddy's Geometry journey. Lesson 61 of 62.

Ticks and an expression apex: the isosceles double copy meets the triangle budget. Read the marks first; they hold half the equation.

Challenge

Hard

The triangle in the figure has apex (x + 50)° and one base angle of 45°.

$An isosceles triangle with apex x plus 50 degrees and a marked base angle of 45 degrees$

Find x.

Try it yourself

(x + 50) + (45 + 45) = 180

Solve for x

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Angles

2Straight Lines and Supplements

5Around a Point

8Transversal Problems

11The Exterior Angle

3Right Angles and Complements

6The Angle Bisector

9Triangle Angle Sum

12Final Challenges