A quadrilateral has three acute angles.

Question:

A quadrilateral has three acute angles. If each measures 80°, then the measure of the fourth angle is

(a) 150o 

(b) 120o 

(c) 105o 

(d) 140o

Solution:

(b) 120o

We know that, sum of all interior angle of quadrilaterals is equal to 360o.

Let us assume the fourth angle be x

Then,

80o + 80o + 80o + x = 360o

240o + x = 360o

x = 360o – 240o

x = 120o

Leave a comment

Close

Click here to get exam-ready with eSaral

For making your preparation journey smoother of JEE, NEET and Class 8 to 10, grab our app now.

Download Now