GED Geometry Practice: 25 Questions, Zero Proofs

If the word “geometry” makes your stomach drop, you’re not alone.

But GED geometry is really just measuring. How much carpet covers this floor? How much fence goes around this yard? How much water fills this tank?

The catch? The formula sheet gives you the formulas, but it won’t tell you which one to use or where each number goes. That’s where people lose points, and that’s what this page helps with.

On this page you’ll get:

• 25 practice questions (scroll up), new ones every time
• What GED geometry questions really look like
• The 4 mistakes that cost the most points, and how to dodge them
• One problem worked out step by step

Skills in this set: Volume of a cylinder · Pythagorean theorem · Area of a rectangle or square · Area of a triangle · Area of a parallelogram · Area of a trapezoid · Area and circumference of a circle · Perimeter in context · Volume of a rectangular prism · Finding a cylinder's height from its volume · Volume of a cone · Volume of a sphere · Volumes of a prism, a pyramid and a cone · Surface area of a rectangular prism · Surface area of a cylinder · Pythagorean theorem in context · Area of a composite figure · Scale drawings and actual measurements

What GED geometry questions look like

Almost every geometry question is a small real-life job. You’ll see a garden to fence, a room to carpet, a can to label or a tank to fill.

You’ll be asked to find one of four things. Perimeter is the distance around a shape (the fence). Area is the flat space inside it (the carpet). Volume is how much a 3D object holds (the water). Surface area is the outside skin of a 3D object (the label on the can).

The shapes are the ones you already know: rectangles, triangles, circles, and boxes, cans, cones and balls. Sometimes two shapes are stuck together, like an L-shaped room. You also get the Pythagorean theorem, for questions like how long a ladder needs to be.

How many questions? GED Testing Service doesn’t publish a count per topic. Geometry shares about 20% of the test with data and statistics, so our estimate is four to six geometry questions out of about 46.

You’ll have the on-screen calculator for nearly all of them. If one shows up in the short no-calculator part at the start, the numbers will be small enough to do by hand.

The topics and area weights come from GED Testing Service’s official test guide. It doesn’t publish a question count per topic, so any count here is our estimate.

The 4 mistakes that cost the most points

Each wrong answer in the practice set is the result of one specific slip, and the explanation names it. These are the ones that come up most in this topic.

One problem, worked out step by step

How to get better at this, fast

1. Label before you calculate. Write r = 3, h = 10 next to the problem. It takes five seconds and catches the diameter slip every time.
2. Remember three shortcuts: a triangle is half a rectangle, a cone is a third of a can, and a pyramid is a third of a box. If you blank on a formula, these rebuild it.
3. Guess the size first. A tank 6 feet across and 10 feet tall should hold a few hundred cubic feet. If your answer is in the thousands, something slipped.
4. Break odd shapes into pieces. An L-shaped room is two rectangles. Find each area, then add. If a piece is cut out, subtract it instead.