Question

85. Find the third angle of a right angled triangle whose one of the angles is 40°
(b) 40°
(a) 60
(d) 50°
(c) 70°​

Answer 1

Answer:

d.50° is the correct answer.

Step-by-step explanation:

hope this will help you......

Answer 2

Question:-

Find the third angle of a right angled triangle whose one of the angles is 40°

(b) 40°

(a) 60

(d) 50°

(c) 70°

Answer:-

• The third angle is 50°

To find:-

• Third angle

Solution:-

• First angle = 90°
• Second angle = 40°

As we know,

• Sum of all angles of triangle = 180°

Let,

• Third angle = x

According to question,

$\large{ \rm : \implies \: \: \: \: \: \: \: \: \: \: 90 + 40 + x = 180 \degree}$

$\large{ \rm : \implies \: \: \: \: \: \: \: \: \: \: 130 \degree + x = 180 \degree}$

$\large{ \rm : \implies \: \: \: \: \: \: \: \: \: \: x = 180 \degree - 130 \degree}$

$\large{ \rm : \implies \: \: \: \: \: \: \: \: \: \: x = 50 \degree}$

Hence,

The third angle is 50°

The correct option is (d)