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Understanding Quadrilaterals & Practical Geometry | Understanding Quadrilaterals & Practical Geometry - Exercise

Question 28

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

(a) 150 degrees

(b) 120 degrees

(c) 105 degrees

(d) 140 degrees

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(b) 120 degrees

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

Let us assume the fourth angle be x

Then,

80 degrees + 80 degrees + 80 degrees + x = 360 degrees

240 degrees + x = 360 degrees
x = 360 degrees – 240 degrees

x = 120 degrees

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Question 28

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

(a) 150 degrees

(b) 120 degrees

(c) 105 degrees

(d) 140 degrees

Looking to do well in your science exam ? Learn from an expert tutor. Book a free class!

(b) 120 degrees

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

Let us assume the fourth angle be x

Then,

80 degrees + 80 degrees + 80 degrees + x = 360 degrees

240 degrees + x = 360 degrees
x = 360 degrees – 240 degrees

x = 120 degrees

Our top 5% students will be awarded a special scholarship to Lido.

subject-cta
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