01Question 1
Medium
In a triangle, an exterior angle measures 120°, and one of the two remote interior angles measures 45°. What is the measure of the other remote interior angle?
Geometry and Trigonometry
SAT lines, angles, and triangles practice questions
Angles formed by intersecting and parallel lines, triangle angle sums, exterior angles, and congruent and similar triangles.
Practice lines, angles, and triangles 45 questions, no account needed.
The usual trap
With similar triangles, match corresponding sides before you set up a ratio. A ratio built from the wrong pair of sides is the usual trap.
Try three questions
Pick an answer to check it and see why. Practice sets also have grid-ins, where you type the answer.
02Question 2
Medium
Triangle ABC is similar to triangle DEF, with AB corresponding to DE. If AB = 6, DE = 9, and BC = 8, what is the length of EF?
03Question 3
Medium
Parallel lines are cut by a transversal. One interior angle measures 65°. What is the measure of the co-interior (same-side interior) angle?
Keep going
Start a set in this skill. Every answer comes with an explanation.
Practice lines, angles, and triangles
45 questions in the bank: 8 Easy, 29 Medium, 8 Hard.