To solve the GMAT Quantitative Reasoning questions or the geometry questions in the GMAT exam, it’s essential you are thorough with the GMAT Math Geometry formulas as it makes solving questions faster and easier. Here is an article that covers all the basic geometry formulas you need to ace Geometry questions in the quant section.

So let’s take a look at this GMAT Math Geometry formulas list.

Geometry Questions

Geometry Solutions

Perimeter Formulas

Area Formulas

Surface Area Formulas

Volume Formulas

Circle

Circumference of a Circle

Circumference (C) = pi.d = 2 times pi.r

Where, d = Diameter and r = Radius

Area of a Circle

Area (A) = pi.r^{2}

Pythagoras Theorem

The Pythagorean Theorem states that the area of the square built upon the hypotenuse of a right triangle is equal to the sum of the areas of the squares upon the remaining sides.

This implies that in the above Triangle, a and b are the lengths of the two legs of the triangle and c is the length of the hypotenuse of the triangle.

a^2 + b^2 = c^2

For any GMAT Arithmetic or Quantitative Reasoning problem, formulas are those fundamentals that help you to think and solve them with ease. Hence, memorizing these GMAT math geometry formulas thoroughly helps solve easy or even difficult problems faster. We have listed some important geometry formulas including surface area formulas, volume formulas, and formulas for GMAT Circles, that you need to know. However, you may also look for GMAT geometry formulas PDF online to get a better picture. But, make it a point to refer to credible resources or websites.

GMAT Geometry Sample Questions

1. In the figure below, line segment is parallel to CD. What is the value of “a”?

1. 20
2. 40
3. 80
4. 100
5. 140

Explanation:

Since AB is parallel to CD,

2×0+a0=1800…Equation (1)

Because Big angle + Small angle is 180 degrees.

Now DEC is a triangle, where sum of the all angles of a triangle is 180 degrees.

So, a0+x0+400=1800

a0+x0=1400…Equation (2)

Solving both the equations we get,

x = 40

so, a = 100.

2. In triangle ABC below, if AC = 12 inches, then what is the length of AB in inches?

Note: Figure not drawn to scale

1. 3
2. 6
3. 62
4. 66
5. 18

Explanation:

Re-draw the diagram and label all the angles as mentioned below,

We can see the 30-60-90 triangle and 45-45-90 triangle.

In 30-60-90 triangle, sides are in the ratio of a-a3-2a

In 45-45-90 triangle, sides are in the ratio of a-a-a√2

ADC is 30-60-90 triangle, given that AC = 12

Hence the sides are, 6-63-12

So, the sides are, 63-63-66. So, AB length is 66

Now that you are aware of almost all the GMAT math Geometry formulas, you’re better positioned to apply these formulas to the various Geometry questions that appear in your practice or mock tests and of course the actual exam. All the best!

FAQs

1. How Can I Prepare for the GMAT Quant section?

The most important step to preparing for the GMAT Quant section is practising the Quant concepts. You can do so by attempting sample questions and GMAT mock tests. You can also look for GMAT Geometry Formulas PDF online to help you familiarize yourself with all geometry formulas.

1. How can I memorize geometry formulas for the GMAT Quant section?

An easy way to memorize formulas for the GMAT Quant section is by creating a GMAT Geometry cheat sheet. A cheat sheet is nothing but a list of all the geometry formulas. You can place this cheat sheet on your mirror or any space that you visit on a regular basis. This will help you memorize the formulas in no time.

1. What is the surface area formula for a cube?

The surface area formula for a rectangle solid is V = s^{3}, where s = sides of the cube.

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