PSAT: Questions

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Word of the Day

invariable
Definition: (adjective) not changing or subject to change.
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Math Teaser

Problem
A group of 9 friends invest equally in a business opportunity that costs $20,000. If n more friends were to take part evenly in the investment...

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SAT* Tip of the Day

So What?
Math questions involving two equations and two unknowns can usually be combined into one equation with one unknown.
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PSAT: Math Question #4

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Question:

The length of an arc of a circle equals

	1

	8

of the circle's

circumference. What is the diameter of the circle if the length of

the arc is

Choices:

The correct answer is (D).

Now, it is easy to find the diameter, d, using the formula for the circumference of a circle.

The correct answer is (D).

Since the length of the arc is

, and this length is

	1

	8

of the

circumference, the circumference must be 8

Now, it is easy to find the diameter, d, using the formula for the circumference of a circle.

Circumference

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