Question 22
Fill in the blanks to make the statements true.
In the given figure,
a) ∠AOD is a/an
b) ∠COA is a/an
c) ∠AOE is a/an
a) Right
Since, ∠AOD = ∠AOB + ∠BOC + ∠COD
= 30∘ + 20∘ + 40∘ = 90∘
So, ∠AOD = 90∘ is a right angle.
b) Acute
Since, ∠COA = ∠COB + ∠BOA
= 20∘ + 30∘ = 50∘
Because ∠COA = 50∘ < 90∘
So, ∠ COA is an acute angle.
c) Obtuse
Since, ∠AOE = ∠AOB + ∠BOC + ∠COD + ∠DOE
= 30∘ + 20∘ + 40∘ + 40∘ = 130∘
Because ∠AOE = 130∘> 90∘
So, ∠ AOE is an obtuse angle.