Q85
If two angles of a triangle are 21° and 38°, then the triangle is :
A.
Right-angled triangle
B.
Acute-angled triangle
C.
Obtuse-angled triangle
AnswerD.
Isosceles triangle
Answer: Option C
Solution
Answer: Option C
Solution:
According to question,
Given :
∠A = 21°, ∠C = 38°
As we know that
∠A + ∠B + ∠C
∠B = 180° - 21° - 38°
∠B = 121°
∴ The triangle is obtuse-angled triangle.