In rectangle ABCD , diagonals AC and BD intersect at O. If angle AOB= 118⁰. Find (i) angle ABO (ii) angle ADO (iii) angle OCB.
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8th
Maths
Understanding Quadrilaterals
Some Special Parallelograms
In a rectangle ABCD, diagon...
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Asked on December 26, 2019 by
Hardik Shiwankar
In a rectangle ABCD, diagonals intersect at O. If ∠OAB=30
o
find: ∠ACB, ∠ABO, ∠COD, ∠BOC.
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In △ABC,
⇒ ∠CAB+∠ABC+∠ACB=180
o
.
⇒ 30
o
+90
o
+∠ACB=180
o
.
⇒ 120
o
+∠ACB=180
o
.
∴ ∠ACB=60
o
We know that, diagonals of rectangle are equal and bisect each other equally.
∴ AO=OC=BO=OD
In △ABO,
⇒ AO=BO
⇒ ∠OAB=∠ABO [ Angle opposite to equal side are also equal ]
⇒ ∠OAB=∠ABO=30
o
⇒ ∠OAB+∠ABO+∠BOA=180
o
⇒ 30
o
+30
o
+∠BOA=180
o
.
⇒ ∠BOA=120
o
.
⇒ ∠BOA=∠COD [ Vertically opposite angle ]
∴ ∠COD=120
o
⇒ ∠COD+∠BOC=180
o
[ Linear pair ]
⇒ 120
o
+∠BOC=180
o
∴ ∠BOC=60
o
.
⇒ ∠ACB=60
o
,∠ABO=30
o
,∠COD=120
o
and ∠BOC=60
o
.
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