In the given diagram AB || GH || DE and GF || BD|| HI, ∠FGC=80∘.Find the value of ∠CHI :
In quadrilateral ABCD, side AB is parallel to side DC and ∠A : ∠D = 1 : 2 and ∠C : ∠B = 4 : 5. Measure of angles of quadrilateral ABCD are
The following figure shows a quadrilateral with sides AB and DC parallel to each other.
If ∠A:∠D=4:5
∠B=(3x−15)∘ and
∠C=(4x+20)∘
Which of the following options is/are correct ?