GEOMETRY

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!
The sum of the three angles of a triangle is .

The exterior angle of a triangle is equal to the sum of the angles to it.

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

The difference between any two sides of a triangle than the third side.

Angles opposite to equal sides are and vice – versa.

figures have the same shapes but different sizes.

figures are exactly the same in shape and size.

Two triangles are similar if two angles of one triangle are respectively to two angles of the other triangle.

Two triangles are similar if two sides of one triangle are to two sides of the other triangle and the angles are equal.

Two triangles are similar if their corresponding sides are in the .

If two triangles are Similar, then their angles are respectively and their corresponding sides are .

If the three sides of a triangle are congruent to the three sides of another triangle, then the triangles are .

If two sides and the included angle of a triangle are congruent to and the of another triangle, then the triangles are congruent.

Any segment or angle is congruent to itself! This is called .

If two angles are both congruent and supplementary then, they are .

A polygon that is formed by 4 sides is called a .

A polygon in which atleast one interior angle is more than 180°, is called a .

A polygon in which each interior angle is less than 180°, is called a .

Corresponding sides of similar triangles are .

Similar triangles have the same but not necessarily the same size.

In similar triangles, sides are opposite to equal angles.

Two triangles are similar if two angles of one triangle are equal respectively to two angles of the other triangle. This is Similarity.

Two triangles are similar if two sides of one triangle are proportional to two sides of the other triangle and the included angles are equal. This is Similarity.

Two triangles are similar if the corresponding sides of two triangles are in the same ratio. This is Similarity.

There are to prove that two triangles are congruent.

To construct a quadrilateral, are needed.

If two triangles are congruent, then their corresponding parts are congruent. This is called .