Question 7

Lengths of sides of a triangle are 3 cm, 4 cm and 5 cm. The triangle is

a) Obtuse-angled triangle
b) Acute angled triangle
c) Right angled triangle
d) An isosceles right triangle.

Q.

A triangle of sides AB = 5 cm, BC = 4 cm and AC = 3 cm is constructed. Then $△$ABC is

Q.

Question 14

If in an isosceles triangle, each of the base angle is ${40}^{\circ }$, then the triangle is

a) Right angled triangle
b) Acute angled triangle
c) Obtuse-angled triangle
d) Isosceles right-angled triangle

Q. Question 4
The angles of a triangle are in the ratio 5 : 3 : 7. The triangle is:

A) An acute-angled triangle
B) An obtuse-angled triangle
C) A right-angled triangle
D) An isosceles triangle

Q. If $\overrightarrow{x}$ and $\overrightarrow{y}$ are two non-parallel vectors and $ABC$ is a triangle with side lengths $a,b$ and $c$ satisfying $(20a-15b)\overrightarrow{x}+(15b-12c)\overrightarrow{y}+(12c-20a)(\overrightarrow{x}\times \overrightarrow{y})=\overrightarrow{0}$, then triangle $ABC$ is

Q. In $\Delta ABC,\sin C+\cos C+\sin (2B+C)-\cos (2B+C)=2\sqrt{2}.$ Then the $\Delta ABC$ is