How to find the perimeter of an acute / obtuse triangle - GRE Quantitative Reasoning
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The obtuse Isosceles triangle shown above has two sides with length  and one side length
 and one side length  . The length of side
. The length of side  
  . The length of side
. The length of side  . Find the perimeter of the triangle.
. Find the perimeter of the triangle.

The obtuse Isosceles triangle shown above has two sides with length  and one side length 
. The length of side 
 
. The length of side 
. Find the perimeter of the triangle.
To solve this problem, apply the formula: 
Side  , side
, side  must equal
 must equal 
Since this is an Isosceles triangle, there must be two sides with a length of  .
.
Thus, plug in each side lengths value to find the solution:

To solve this problem, apply the formula: 
Side , side 
 must equal 
Since this is an Isosceles triangle, there must be two sides with a length of .
Thus, plug in each side lengths value to find the solution:
Compare your answer with the correct one above

The obtuse Isosceles triangle shown above has two sides with length  and one side length
 and one side length  . The length of side
. The length of side  
  . The length of side
. The length of side  . Find the perimeter of the triangle.
. Find the perimeter of the triangle.

The obtuse Isosceles triangle shown above has two sides with length  and one side length 
. The length of side 
 
. The length of side 
. Find the perimeter of the triangle.
To solve this problem, apply the formula: 
Side  , side
, side  must equal
 must equal 
Since this is an Isosceles triangle, there must be two sides with a length of  .
.
Thus, plug in each side lengths value to find the solution:

To solve this problem, apply the formula: 
Side , side 
 must equal 
Since this is an Isosceles triangle, there must be two sides with a length of .
Thus, plug in each side lengths value to find the solution:
Compare your answer with the correct one above

The obtuse Isosceles triangle shown above has two sides with length  and one side length
 and one side length  . The length of side
. The length of side  
  . The length of side
. The length of side  . Find the perimeter of the triangle.
. Find the perimeter of the triangle.

The obtuse Isosceles triangle shown above has two sides with length  and one side length 
. The length of side 
 
. The length of side 
. Find the perimeter of the triangle.
To solve this problem, apply the formula: 
Side  , side
, side  must equal
 must equal 
Since this is an Isosceles triangle, there must be two sides with a length of  .
.
Thus, plug in each side lengths value to find the solution:

To solve this problem, apply the formula: 
Side , side 
 must equal 
Since this is an Isosceles triangle, there must be two sides with a length of .
Thus, plug in each side lengths value to find the solution:
Compare your answer with the correct one above

The obtuse Isosceles triangle shown above has two sides with length  and one side length
 and one side length  . The length of side
. The length of side  
  . The length of side
. The length of side  . Find the perimeter of the triangle.
. Find the perimeter of the triangle.

The obtuse Isosceles triangle shown above has two sides with length  and one side length 
. The length of side 
 
. The length of side 
. Find the perimeter of the triangle.
To solve this problem, apply the formula: 
Side  , side
, side  must equal
 must equal 
Since this is an Isosceles triangle, there must be two sides with a length of  .
.
Thus, plug in each side lengths value to find the solution:

To solve this problem, apply the formula: 
Side , side 
 must equal 
Since this is an Isosceles triangle, there must be two sides with a length of .
Thus, plug in each side lengths value to find the solution:
Compare your answer with the correct one above

The obtuse Isosceles triangle shown above has two sides with length  and one side length
 and one side length  . The length of side
. The length of side  
  . The length of side
. The length of side  . Find the perimeter of the triangle.
. Find the perimeter of the triangle.

The obtuse Isosceles triangle shown above has two sides with length  and one side length 
. The length of side 
 
. The length of side 
. Find the perimeter of the triangle.
To solve this problem, apply the formula: 
Side  , side
, side  must equal
 must equal 
Since this is an Isosceles triangle, there must be two sides with a length of  .
.
Thus, plug in each side lengths value to find the solution:

To solve this problem, apply the formula: 
Side , side 
 must equal 
Since this is an Isosceles triangle, there must be two sides with a length of .
Thus, plug in each side lengths value to find the solution:
Compare your answer with the correct one above

The obtuse Isosceles triangle shown above has two sides with length  and one side length
 and one side length  . The length of side
. The length of side  
  . The length of side
. The length of side  . Find the perimeter of the triangle.
. Find the perimeter of the triangle.

The obtuse Isosceles triangle shown above has two sides with length  and one side length 
. The length of side 
 
. The length of side 
. Find the perimeter of the triangle.
To solve this problem, apply the formula: 
Side  , side
, side  must equal
 must equal 
Since this is an Isosceles triangle, there must be two sides with a length of  .
.
Thus, plug in each side lengths value to find the solution:

To solve this problem, apply the formula: 
Side , side 
 must equal 
Since this is an Isosceles triangle, there must be two sides with a length of .
Thus, plug in each side lengths value to find the solution:
Compare your answer with the correct one above

The obtuse Isosceles triangle shown above has two sides with length  and one side length
 and one side length  . The length of side
. The length of side  
  . The length of side
. The length of side  . Find the perimeter of the triangle.
. Find the perimeter of the triangle.

The obtuse Isosceles triangle shown above has two sides with length  and one side length 
. The length of side 
 
. The length of side 
. Find the perimeter of the triangle.
To solve this problem, apply the formula: 
Side  , side
, side  must equal
 must equal 
Since this is an Isosceles triangle, there must be two sides with a length of  .
.
Thus, plug in each side lengths value to find the solution:

To solve this problem, apply the formula: 
Side , side 
 must equal 
Since this is an Isosceles triangle, there must be two sides with a length of .
Thus, plug in each side lengths value to find the solution:
Compare your answer with the correct one above

The obtuse Isosceles triangle shown above has two sides with length  and one side length
 and one side length  . The length of side
. The length of side  
  . The length of side
. The length of side  . Find the perimeter of the triangle.
. Find the perimeter of the triangle.

The obtuse Isosceles triangle shown above has two sides with length  and one side length 
. The length of side 
 
. The length of side 
. Find the perimeter of the triangle.
To solve this problem, apply the formula: 
Side  , side
, side  must equal
 must equal 
Since this is an Isosceles triangle, there must be two sides with a length of  .
.
Thus, plug in each side lengths value to find the solution:

To solve this problem, apply the formula: 
Side , side 
 must equal 
Since this is an Isosceles triangle, there must be two sides with a length of .
Thus, plug in each side lengths value to find the solution:
Compare your answer with the correct one above