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Question

Question 22

Fill in the blanks to make the statements true.

In the given figure,

a) AOD is a/an______angle.

b) COA is a/an______angle.

c) AOE is a/an______angle.


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Solution

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.


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