All ISEE Upper Level Quantitative Resources
Example Questions
Example Question #11 : Pentagons
In Pentagon ,
The other four angles are congruent to one another.
What is ?
It is impossible for this pentagon to exist.
The degree measures of a pentagon, which has five angles, total .
.
Let . Then since the other three angles all have the same measure as ,
Therefore, we can set up, and solve for in, the equation
Example Question #11 : Pentagons
You are given pentagon .
Which is the greater quantity?
(A)
(B)
(A) and (B) are equal
(A) is greater
(B) is greater
It is impossible to determine which is greater from the information given
It is impossible to determine which is greater from the information given
It is impossible to tell, as scenarios can be constructed that would allow to be less than, equal to, or greater than 108, keeping in mind that the sum of the degree measures of a pentagon is .
Case 1: The pentagon is regular, so all five angles are of the same measure:
This fits the conditions of the problem and makes the two quantities equal.
Case 2:
The sum of the angle measures is therefore
This also fits the conditions of the problem, and makes (B) greater.
Example Question #131 : Geometry
Note: Figure NOT drawn to scale
In the above figure, and are adjacent sides of a regular pentagon; and are adjacent sides of a regular hexagon. Which of the following is the greater quantity?
(a)
(b)
It cannot be determined which of (a) and (b) is greater
(b) is the greater quantity
(a) and (b) are equal
(a) is the greater quantity
(a) is the greater quantity
Extend as seen below:
, as an interior angle of a regular pentagon (five-sided polygon), has measure
.
Its exterior angle has measure .
, as an interior angle of a regular hexagon (six-sided polygon), has measure
.
Its exterior angle has measure .
Add the measures of and to get that of :
.
.