ISEE Middle Level Math : Plane Geometry
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Example Questions
Example Question #1 : How To Find The Perimeter Of A Triangle
A triangle has sides 
The perimeter of any figure is the sum of the lengths of the sides: 
Example Question #3 : How To Find Perimeter Of A Triangle
A right triangle with hypotenuse 65 has one leg of length 60. What is its perimeter?
By the Pythagorean Theorem, if 
Set 
The perimeter of the triangle - the sum of the sidelengths - is
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 #1 : Triangles
Find the perimeter of a right triangle, whose two legs are 5 and 12.
To solve, you must first use the Pythagorean Theorem to solve for the hypotenuse and then add that value to the two perimeter values given.
Thus,
Example Question #5 : How To Find The Perimeter Of A Triangle
If an equilateral triangle has a perimeter of 
Cannot be determined
An equilateral triangle has three equal length sides.
The perimeter of a triangle is all the sides added together.
Since all the sides are the same length the equation
is equal to
To find the side length, you just need to divide the perimeter by 
Example Question #6 : Triangles
Find the perimeter of an equilateral triangle that has a side with a length of 11 inches.
To find the perimeter of a triangle, we use the following formula:
where a, b, and c are the sides of the triangle.
Now, we know the triangle is equilateral. This means that each side of the triangle is the same length. We know one side is 11 inches. Therefore, all sides are 11 inches. Knowing this, we can substitute. We get
Example Question #2 : How To Find The Perimeter Of A Triangle
Find the perimeter of an equilateral triangle whose side measures 14 meters.
Cannot be determined from the information provided.
Find the perimeter of an equilateral triangle whose side measures 14 meters.
The perimeter of a shape is simply the distance around it.
An equilateral triangle has three equal sides.
To find the perimeter in this case, simply multiply one side by 3.
So our answer is 42 meters.
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