SSAT Middle Level Math : Plane Geometry
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Example Questions
Example Question #1 : Plane Geometry
What is the perimeter of an equilateral triangle with a side length 
The perimeter is equal to the sum of the length of the sides. An equilateral triangle has three sides with equal lengths.
Example Question #3 : How To Find The Perimeter Of A Triangle
Find the perimeter of a triangle with sides 
Perimeter involves adding up all of the sides of the shapes; in this case, it's a triangle. Perimeter equals 
Example Question #11 : How To Find Perimeter Of A Triangle
A right triangle has legs 
The length of the hypotenuse of the triangle can be found using the Pythagorean Theorem. Substitute 
Its perimeter is 
Example Question #2 : How To Find The Perimeter Of A Triangle
An equilateral triangle has perimeter 
An equilateral triangle has three sides of equal measure, so divide its perimeter by 
Example Question #13 : How To Find Perimeter Of A Triangle
Find the perimeter of an equilateral triangle with a base of 11in.
To find the perimeter of a triangle, we will use the following formula:
where a, b, and c are the lengths of the sides of the triangle.
Now, we know the base of the equilateral triangle is 11in. Because it is an equilateral triangle, all sides are equal. Therefore, all sides are 11in.
So, we can substitute. We get
Example Question #11 : How To Find Perimeter Of A Triangle
Which of these choices can the perimeter of an isosceles triangle possibly be if you know that two sides have lengths 12 and 13?
An isosceles triangle has two sides of equal length. If two sides of an isoscelese triangle are of length 12 and 13, then the third must be of length 12 or 13.
This makes the perimeter either
or
Of our choices, we choose 38.
Example Question #1 : How To Find The Perimeter Of A Square
Florence wants to build a fence to surround her square garden. The garden has an area of 16 square yards. How much fencing will she need?
So this question requires you to know the formula for area for a square which is side squared.
Thus, 
To figure out the perimeter, add up all of the sides of the square which are all the same (4).
Example Question #2 : How To Find The Perimeter Of A Square
A square has perimeter 89.4 centimeters. What is the length of one side?
A square has four sides of equal measure, so divide its perimeter by 4:
Example Question #3 : How To Find The Perimeter Of A Square
A square has perimeter 16 feet 4 inches. What is the length of one side?
4 feet 1 inch
3 feet 9 inches
4 feet 5 inches
4 feet 3 inches
3 feet 11 inches
4 feet 1 inch
One foot is equal to 12 inches, so the perimeter 16 feet 4 inches is equal to 
An square has four sides of equal measure, so divide its perimeter by 4:
To convert 49 inches to feet and inches:
One side measures 4 feet 1 inch.
Example Question #4 : Squares
The length of one side of a square is 
The perimeter of a shape is the distance around the outside boundry of that shape.
In order to find the perimeter, add up the lengths of the sides of that shape.
Because a square has four equal sides, add 
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