TRIANGLES

Gap-fill exercise

  
Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
A closed figure formed by three intersecting lines is called a .

A triangle has three sides, three angles and three .

means equal in all respects or figures whose shapes and sizes are both the same.

A triangle in which two sides are equal is called an triangle.

Angles opposite to equal sides of an isosceles triangle are .

The sides opposite to equal angles of a triangle are .

If two sides of a triangle are , the angle opposite to the longer side is larger.

The sum of any two sides of a triangle is than the third side.

In any triangle, the side opposite to the larger (greater) angle is .

Two figures are , if they are of the same shape and of the same size.

Two of the same radii are congruent.

Two of the same sides are congruent.

If two sides and the included angle of one triangle are equal to two sides and the included angle of the other triangle, then the two triangles are congruent ( Rule).

If two angles and the included side of one triangle are equal to two angles and the included side of the other triangle, then the two triangles are congruent ( Rule).

If two angles and one side of one triangle are equal to two angles and the corresponding side of the other triangle, then the two triangles are congruent ( Rule).

Each angle of an triangle is of 60°.