Triangles

A triangle has ______vertices, _______ angles and ________sides.

• 3,2,3

• 3,3,3

• 3,1,2

A right-angled triangle can be isosceles triangle.

• True

• False

Any three line-segments make up a triangle.

• True

• False

Choose all the triangles that are possible with angles:

• 110°, 60°, 30°

• 90°, 60°, 30°

• 50°, 50°, 90°

• 70°, 70°, 70°

• 80°, 35°, 65°

Choose all the triangles that are possible with the given group of sides:

• 7 cm, 3 cm, 4 cm

• 10 cm, 12 cm, 2 cm

• 8 cm, 12 cm, 10 cm

• 3cm, 4cm, 1cm

• 6cm, 6cm, 6cm

One of the acute angles of a right triangle is 48°. Find the other acute angle.

• 42°

• 48°

• 60°

In an isosceles triangle, the angles opposite to the equal sides are ____________.

• unequal

• equal

An equilateral triangle is also an ______________________ triangle.

• Right angled

• Obtuse angled

• Acute angled

A triangle can have all the three angles less than 60°.

• True

• False

If two angles ∠CBA and ∠CAB of a ▲ABC measures 50° and 60° respectively. Find the measure of ∠ACB of the triangle.

• 60°

• 70°

• 50°