All SSAT Upper Level Math Resources
Example Questions
Example Question #11 : Area And Circumference Of A Circle
Give the area of a circle that circumscribes a right triangle with legs of length and .
If a right triangle is inscribed inside a circle, then the arc intercepted by the right angle is a semicircle, making the hypotenuse of triangle a diameter.
The length of the hypotenuse of this triangle can be calculated using the Pythagorean Theorem:
The radius is half this, or 13, so the area is
Example Question #11 : Area And Circumference Of A Circle
A central angle of a circle has a chord with length . Give the area of the circle.
The figure below shows , which matches this description, along with its chord and triangle bisector .
We will concentrate on , which is a 30-60-90 triangle.
Chord has length 15, so
By the 30-60-90 Theorem,
and
This is the radius, so the area is
Example Question #1 : Area Of A Circle
What is the area of a circle that has a diameter of inches?
The formula for finding the area of a circle is . In this formula, represents the radius of the circle. Since the question only gives us the measurement of the diameter of the circle, we must calculate the radius. In order to do this, we divide the diameter by .
Now we use for in our equation.
Example Question #103 : Geometry
What is the area of a circle with a diameter equal to 6?
First, solve for radius:
Then, solve for area:
Example Question #104 : Geometry
The diameter of a circle is . Give the area of the circle.
The area of a circle can be calculated using the formula:
,
where is the diameter of the circle, and is approximately .
Example Question #4 : Know And Use The Formulas For The Area And Circumference Of A Circle: Ccss.Math.Content.7.G.B.4
The diameter of a circle is . Give the area of the circle in terms of .
The area of a circle can be calculated using the formula:
,
where is the diameter of the circle and is approximately .
Example Question #1 : Area Of A Circle
The radius of a circle is . Give the area of the circle.
The area of a circle can be calculated as , where is the radius of the circle, and is approximately .
Example Question #3 : How To Find The Area Of A Circle
The perpendicular distance from the chord to the center of a circle is , and the chord length is . Give the area of the circle in terms of .
Chord length = , where is the radius of the circle and is the perpendicular distance from the chord to the circle center.
Chord length =
, where is the radius of the circle and is approximately .
Example Question #1 : Area Of A Circle
The circumference of a circle is inches. Find the area of the circle.
Let .
First we need to find the radius of the circle. The circumference of a circle is , where is the radius of the circle.
The area of a circle is where is the radius of the circle.
Example Question #11 : Geometry
Find the area of a circle with a radius of 100.
Write the formula for a circle.
Substitute the radius.
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