Class 9 Triangles

In triangle ABC, if AB=BC and ∠B = 70°, ∠A will be:

• 70°

• 110°

• 55°

• 130°

For two triangles, if two angles and the included side of one triangle are equal to two angles and the included side of another triangle. Then the congruency rule is:

• SSS

• ASA

• SAS

• AAS

A triangle in which two sides are equal is called:

• Scalene triangle

• Equilateral triangle

• Isosceles triangle

• None of the above

The angles opposite to equal sides of a triangle are:

• Equal

• Unequal

• Supplementary angles

• Complementary angles

ABC is an isosceles triangle in which altitudes BE and CF are drawn to equal sides AC and AB respectively. Then:

• BE>CF

• BE<CF

• BE=CF

• None of the above

If E and F are the midpoints of equal sides AB and AC of a triangle ABC. Then:

• BF=AC

• BF=AF

• CE=AB

• BF = CE

If ABC and DBC are two isosceles triangles on the same base BC. Then:

• ∠ABD = ∠ACD

• ∠ABD > ∠ACD

• ∠ABD < ∠ACD

• None of the above

If ABC is an equilateral triangle, then each angle equals to:

• a. 90°

• B.180°

• c. 120°

• d. 60°

If AD is an altitude of an isosceles triangle ABC in which AB = AC. Then:

• BD=CD

• b. BD>CD

• c. BD<CD

• d. None of the above

In a right triangle, the longest side is:

• Perpendicular

• Hypotenuse

• Base.

• None of the above