Acute Angled Triangle

Q.

If D, E and F are the mid points of the sides BC, CA and AB of an equilateral triangle ABC, then triangle DEF is

1. Scalene triangle

2. Right tangled triangle

3. Equilateral triangle

4. Isosceles triangle

Q. If the angles of a triangle are 60°, 50°, and 70°, then it is triangle

1. acute angled
2. obtuse angled
3. right angled
4. reflex angled

Q.

In the figure, ABC is an equilateral triangle. Measure of angle BEC is

1. 105^o

2. 120^o

3. 60^o

4. 90^o

Q. Write the sum of the angles of an obtuse triangle.

Q. State 'True' or 'False':
(i) A triangle can have two right angles.
(ii) A triangle cannot have two obtuse angles.
(iii) A triangle cannot have two acute angles.
(iv) A triangle can have each angle less than 60°.
(v) A triangle can have each angle equal to 60°.
(vi) There cannot be a triangle whose angles measure 10°, 80° and 100°.

Q.

In a right triangle ABC, right angled at C, the angle A is 4 times angle B, then the measure of angle B is

1. 12^o

2. 15^o

3. 19^o

4. 18^o

Q.

In figure, which of the following statement is true?

1. ∠B is the greatest angle in triangle

2. ∠B = ∠C

3. ∠B is the smallest angle in triangle

4. ∠A is the smallest angle in triangle

Q. 1. In the triangle PRS =120^° . A point Q is taken on PR such that PQ =QS and QR = RS. The measure of angle QPS is

Q.

Shreya, when measured the angles in a triangle, they came out to be 60°, 50°, and 70° respectively. Now she wants to know what type of triangle it is.
Can you tell what type of triangle it is?

1. Acute angled triangle

2. Obtuse angled triangle

3. Right angled triangle

4. Reflex angled triangle

Q.

Classify the triangle as acute-angled, right-angled and obtuse-angled triangles on the basis of their angles which have been given below-:

$75°,20°,85°$

Q.

The angles of a triangle are in the ratio 5:3:7, the triangle is:

1. A right triangle

2. An obtuse angled triangle

3. An acute angled triangle

4. An isosceles triangle

Q.

Classify the $△\mathrm{MNO}$ with $\mathrm{m}\angle \mathrm{M}=130°,\mathrm{m}\angle \mathrm{N}=30°\&\mathrm{m}\angle \mathrm{O}=20°.$

Q.

Prove that two angle of a triangle must be acute angle .

Q. What is the sum of all angles of triangle

Q.

Classify the following triangles as acute-angled, right angled or obtuse-angled according to the magnitude of their angles.

$40°,60°,80°$

Q.

In a right triangle ABC , right angled at C , the angle A is 4 times angle B. , then the measure of angle B is________

1. 12^o

2. 19^o

3. 18^o

4. 15^o

Q.

State whether the shown triangle is acute, right or obtuse-angled triangle .

Q. Sum of angles in a triangle is ${180}^{\circ }$.

1. False
2. True

Q.

Classify the following triangles as acute, right or obtuse-angled triangles according to the magnitude of their angles.

$120°,33°,27°$

Q.

Classify the triangle as acute-angled, right-angled and obtuse-angled triangles on the basis of their angles which have been given below-:

$65°,85°,30°$

Q. If all the angles of a triangle are less than 90∘ , then it is called triangle.

1. acute-angled
2. right-angled
3. obtuse-angled

Q.

In a triangle ABC, $\angle$B = 35${}^{\circ }$. What type of angle is this ?

1. obtuse

2. straight

3. acute

4. right

Q.

State whether the following statement is true or false.

If one angle of a triangle is less than 90 degrees, it is known as an acute-angled triangle.

1. False

2. True

Q. To classify the triangles on the basis of sides and angles from the given set of triangles

Q. What is the measure of each of the equal angles of a right-angled isosceles triangle?