In the given fig.,

$∠ A O D$ is a/an ___angle.
$∠ C O A$ is a/an _angle.
$∠ A O E$ ia a/an _angle.
$∠ E O C$ ia a/an ___angle.
[4 MARKS]

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Solution

Each blank: 1 Mark

$∠ A O D$ = 40+20+30 = 90 $^{\circ}$ = A right angle
$∠ C O A$ = 20+30 = 50 $^{\circ}$ = An acute angle
$∠ A O E$ = 40+40+20+30 = 130 $^{\circ}$ = An obtuse angle
$∠ E O C$ = 40+40 = 80 $^{\circ}$ = An acute angle

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Question 22

Fill in the blanks to make the statements true.

In the given figure,

a) $∠ A O D$ is a/an______angle.

b) $∠ C O A$ is a/an______angle.

c) $∠ A O E$ is a/an______angle.

Question 22

Fill in the blanks to make the statements true.

In the given figure,

a) $∠ A O D$ is a/an______angle.

b) $∠ C O A$ is a/an______angle.

c) $∠ A O E$ is a/an______angle.

sec 4 A = cosec (A - 20^{\circ})

4 A

A

The steps to construct $75^{\circ}$ angle is given below. Arrange these steps in the correct sequence.

1. At the point O, draw an angle AOE = $60^{\circ}$ .

2. Bisect the ∠DOE.

3. Draw an angle AOD = $90^{\circ}$ at a point O on the line segment OA.

Construct an angle bisector for an angle of $70^{\circ}$ using a compass. [2 MARKS]

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