Question

A quadrilateral has three angles equal to 72∘,72∘ and 106∘. Find its unknown angle. ( A ) 110∘ ( B ) 90∘ ( C ) 60∘ ( D ) 100∘

Answer 1

Answer:

let the unknown angle be x

72+72+106+x=360

260+x=360

x=360-260

x=100

therefore answer is D 100°

Answer 2

Answer:

option (A) is the answer

Step-by-step explanation:

the sum of the four angles of the quadrilateral is equal to 360 degree

let the unknown fourth angle of the quarilateral be x

72°+72°+106°+x= 360°

250°+x=360°

x=360°-250°

=110°