यदि किसी त्रिभुज के दो कोण `21^(@)` तथा `38^(@)` हे, तब त्रिभुज हे|

Options

A. Right-angled
B. Acute-angled
C. Obtuse-angled
D. Isosceles triangle

Answer

C

Explanation

according to question,

Given, `angleA=21^(@)`, `angleC=38^(@)` As we know that
`angleA+angleB+angleC`
`angleB=180^(@)-21^(@)-38^(@)`
`angleB=121^(@)`
`therefore` The triangle is obtuse angled triangle.