All SSAT Upper Level Math Resources
Example Questions
Example Question #10 : How To Find The Area Of A Square
The perimeter of a square is equal to the circumference of a circle with area 4. What is the area of the square?
First, we need the radius of the circle, which can be determined from the area of a circle formula by setting :
Simplifying the expression by splitting the radicand and rationalizing the denominator:
The circumference of the circle is multiplied by the radius, or
This is also the perimeter of the square, so the length of each side is one fourth of this perimeter, or
The area of the square is the square of this common sidelength, or
.
Example Question #11 : How To Find The Area Of A Square
A square and a circle have the same area. The circle has diameter 10. Which expression is equal to the length of one side of the square?
A circle with diameter 10 has radius half this, or 5. The area of the circle can be found using the formula
,
setting :
.
The square also has this area. The length of one side of this square is equal to the square root of this, which is
Simplify this by breaking the radicand, as follows:
Example Question #61 : Areas And Perimeters Of Polygons
A square has the same area as the above right triangle. Give the length of one side of the square.
The area of a right triangle is equal to half the product of the lengths of its legs. Since we know the lengths of one leg and the hypotenuse, we can calculate the length of the other leg using the Pythagorean Theorem. We can use this form:
Setting and equal to the lengths of the hypotenuse and the known leg - 13 and 5, respectively:
The area of the above triangle is
The square also has this area. The length of one side of this square is equal to the square root of this, which is .
Example Question #1 : How To Find The Perimeter Of A Rectangle
The length and width of a rectangle are and . Give its perimeter in terms of .
A rectangle has perimeter , the length and the width. Substitute and in the perimeter formula, and simplify.
Example Question #61 : Areas And Perimeters Of Polygons
A rectangle has length 30 inches and width 25 inches. Which of the following is true about its perimeter?
Its perimeter is between 8 and 9 feet.
Its perimeter is between 4 and 5 feet.
Its perimeter is between 9 and 10 feet.
Its perimeter is between 10 and 11 feet.
Its perimeter is between 5 and 6 feet.
Its perimeter is between 9 and 10 feet.
In inches, the perimeter of the rectangle can be calculated by substituting in the following formula:
The perimeter is 110 inches.
Now divide by 12 to convert to feet:
This makes the perimeter 9 feet 2 inches, which is between 9 feet and 10 feet.
Example Question #2 : How To Find The Perimeter Of A Rectangle
Perimeter of a rectangle is 36 inches. If the width of the rectangle is 3 inches less than its length, give the length and width of the rectangle.
inches
inches
inches
inches
inches
inches
Let:
The perimeter of a rectangle is , where is the length and is the width of the rectangle. The perimeter is known so we can set up an equation in terms of and solve it:
So we can get:
inches
inches
Example Question #3 : How To Find The Perimeter Of A Rectangle
The length and width of a rectangle are and , respectively. Give its perimeter in terms of .
The perimeter of a rectangle is , where is the length and is the width of the rectangle. In order to find the perimeter we can substitute the and in the perimeter formula:
Example Question #2 : How To Find The Perimeter Of A Rectangle
The length of a rectangle is and the width of this rectangle is meters shorter than its length. Give its perimeter in terms of .
The length of the rectangle is known, so we can find the width in terms of :
The perimeter of a rectangle is , where is the length and is the width of the rectangle.
In order to find the perimeter we can substitute the and in the perimeter formula:
Example Question #5 : How To Find The Perimeter Of A Rectangle
A rectangle has a length of inches and a width of inches. Which of the following is true about the rectangle perimeter if ?
Its perimeter is less than 7 feet.
Its perimeter is between 7.2 and 7.4 feet.
Its perimeter is between 7 and 8 feet.
Its perimeter is between 8 and 9 feet.
Its perimeter is more than 8 feet.
Its perimeter is between 7 and 8 feet.
Substitute to get and :
The perimeter of a rectangle is , where is the length and is the width of the rectangle. So we have:
inches
Now we should divide the perimeter by 12 in order to convert to feet:
feet
So the perimeter is 7 feet and 6 inches, which is between 7 and 8 feet.
Example Question #4 : How To Find The Perimeter Of A Rectangle
Which of these polygons has the same perimeter as a rectangle with length 55 inches and width 15 inches?
A regular octagon with sidelength two feet
A regular hexagon with sidelength two feet
A regular heptagon with sidelength two feet
The other answer choices are incorrect.
A regular pentagon with sidelength two feet
The other answer choices are incorrect.
The perimeter of a rectangle is twice the sum of its length and its width; a rectangle with dimensions 55 inches and 15 inches has perimeter
inches.
All of the polygons in the choices are regular - that is, all have congruent sides - and all have sidelength two feet, or 24 inches, so we divide 140 by 24 to determine how many sides such a polygon would need to have a perimeter equal to the rectangle. However,
,
so there cannot be a regular polygon with these characteristics. All of the choices fail, so the correct response is that none are correct.
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