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in Geometry by (51.6k points)
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Fill in the blanks to make the statements true:

In Fig.,

(a) ∠AOD is a/an ______ angle

(b) ∠COA is a/an ______ angle

(c) ∠AOE is a/an ______ angle

1 Answer

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Best answer

From the figure,

(a) ∠AOD is a/an right angle.

Is anyone angle in the triangle is equal to 90o then the triangle is called right triangle.

∠AOD = ∠AOB + ∠BOC + ∠COD

= 30o + 20o + 40o

= 90o

(b) ∠COA is a/an acute angle

An acute angle is an angle formed between 0o to 90o.

∠COA = ∠COB + ∠BOA

= 20° + 30°

= 50o

(c) ∠AOE is a/an obtuse angle

An obtuse angle is an angle formed between 90o to 180o.

∠AOE = ∠EOD + ∠DOC + ∠COB + ∠BOA

= 40° + 40° + 20° + 30°

= 130°

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