Two adjacent angles of a parallelogram are in the ratio of 2:3. What

Question

Two adjacent angles of a parallelogram are in the ratio of 2:3. What is the average angle measure of these two angles?

A. 30.
B. 40.
C. 45.
D. 90.
E. 180.

itoyj · Answer

Sum of 2 adjacent angles of parallelogram = 180
Average = 180/2= 90

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Abhishek009 · Answer

The measures of the adjacent angles of a parallelogram add up to be 180 degrees

So, Average will be 90 , Answer must be (D)

Archit3110 · Answer

5x=180
x=36
avg ; 72+108/2 ; 90
IMO D

unraveled · Answer

Sum of all the angles of parallelogram = 360 deg
Let angles are in ratio 2x:3x

So total sum of angles  = 2x * 2 + 3x * 2 = 10x 
Therefore  10x = 360 
 x = 36

Now average measure of 2x and 3x  = \frac{(2 *36 + 3 * 36)}{2} = 90

Answer (D).

Kinshook · Answer

Since sum of 2 angles = 180
average = 180/2 = 90

IMO D

ScottTargetTestPrep · Answer

Two adjacent angles in a parallelogram will always equal 180, so the average is 90.

Answer: D

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