Question

The first angle of a triangle is 8tº, the second angle is 3tº, and the third angle is 9tº. What is the measure of 9tº ?


a
20º


b
180º


c
81º


d
89º

Answer 1

Answer:

c) 81°

Explanation:

8t+ 3t+ 9t = 180° (Sum of all the angles of a triangle is 180°)

20t = 180°

t = $\frac{180}{20}$

t = 9°

2t = 2×9 = 18°

3t = 3×9 = 27°

9t = 9×9 = 81°

Therefore, 9t is 81°.

Answer 2

Answer:

(c) 81°

Step-by-step explanation:

Given:-

Measurements of the angles of a triangle :-

• 8t°
• 3t°
• 9t°

To find:-

• Measure of 9t°

Solution:-

Since, sum of all angles of a triangle is 180°,

Therefore,

=> 8t° + 3t° + 9t° = 180°

=> 20t° = 180°

=> t = 180/20

=> t = 9°

So, Value of 9t° :

=> 9 × 9° = 81°

Answer :- 81°